UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G


                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                               (AMENDMENT NO. 4)*

                            FalconStor Software, Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)

                         Common Stock, $0.001 Par Value
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   306137100
                                ---------------
                                 (CUSIP Number)

                                December 31, 2005
          ------------------------------------------------------------
              Date of Event Which Requires Filing of this Statement


Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

         |_|  Rule 13d-1(b)
         |X|  Rule 13d-1(c)
         |_|  Rule 13d-1(d)


*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

                                  Page 1 of 7



CUSIP No. 306137100                  13G
--------------------------------------------------------------------------------

1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                              Eli Oxenhorn

--------------------------------------------------------------------------------

2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

                                                                         (a) [ ]

                                                                         (b) [ ]

--------------------------------------------------------------------------------

3     SEC USE ONLY

--------------------------------------------------------------------------------

4     CITIZENSHIP OR PLACE OF ORGANIZATION

                                                                 United States
--------------------------------------------------------------------------------

                     5     SOLE VOTING POWER
    Number of              2,749,500 shares
     Shares       --------------------------------------------------------------
  Beneficially
    Owned By         6     SHARED VOTING POWER
      Each                 241,077 shares
   Reporting      --------------------------------------------------------------
     Person
      With           7     SOLE DISPOSITIVE POWER
                           2,749,500 shares
                  --------------------------------------------------------------

                     8     SHARED DISPOSITIVE POWER
                           241,077 shares
--------------------------------------------------------------------------------

9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                            2,990,577 shares

--------------------------------------------------------------------------------

10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
      (SEE INSTRUCTIONS)
                                                                             [ ]
--------------------------------------------------------------------------------

11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
                                  6.3%

--------------------------------------------------------------------------------

12    TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                   IN

--------------------------------------------------------------------------------

                                  Page 2 of 7


CUSIP No. 306137100                  13G
--------------------------------------------------------------------------------

1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                       Eli Oxenhorn Family Limited Partnership

--------------------------------------------------------------------------------

2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

                                                                         (a) [ ]

                                                                         (b) [ ]

--------------------------------------------------------------------------------

3     SEC USE ONLY

--------------------------------------------------------------------------------

4     CITIZENSHIP OR PLACE OF ORGANIZATION

                                                                      New York
--------------------------------------------------------------------------------

                     5     SOLE VOTING POWER
    Number of              241,077 shares
     Shares       --------------------------------------------------------------
  Beneficially
    Owned By         6     SHARED VOTING POWER
      Each                 0 shares
   Reporting      --------------------------------------------------------------
     Person
      With           7     SOLE DISPOSITIVE POWER
                           241,077 shares
                  --------------------------------------------------------------

                     8     SHARED DISPOSITIVE POWER
                           0 shares
--------------------------------------------------------------------------------

9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                               241,077 shares

--------------------------------------------------------------------------------

10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
      (SEE INSTRUCTIONS)
                                                                             [ ]
--------------------------------------------------------------------------------

11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
                                  0.5%

--------------------------------------------------------------------------------

12    TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                   PN

--------------------------------------------------------------------------------

                                  Page 3 of 7


ITEM 1.
                  (a)      Name of Issuer:
                           FalconStor Software, Inc.

                  (b)      Address of Issuer's Principal Executive Offices:
                           2 Huntington Quadrangle
                           Melville, NY 11747
ITEM 2.
1.                (a)      Name of Person Filing:         Eli Oxenhorn
                  (b)      Address of Principal Business Office, or,
                           if none, Residence:
                                                          56 The Intervale
                                                          Roslyn Estates,
                                                          New York 11576
                  (c)      Citizenship:                   United States
                  (d)      Title of Class of Securities:  Common Stock,
                                                          $0.001 par
                                                          value per share
                  (e)      CUSIP Number:                  306137100

2.                (a)      Name of Person Filing:         Eli Oxenhorn
                                                          Family Limited
                                                          Partnership
                  (b)      Address of Principal Business Office, or,
                           if none, Residence:
                                                          56 The Intervale
                                                          Roslyn Estates,
                                                          New York 11576
                  (c)      Place of Organization:         New York
                  (d)      Title of Class of Securities:  Common Stock,
                                                          $0.001 par
                                                          value per share
                  (e)      CUSIP Number:                  306137100

ITEM 3.           If this statement is filed pursuant to ss.240.13d-1(b) or
                  240.13d-2(b) or (c), check whether the person filing is a:
                  (a)      [ ]      Broker or dealer registered under section
                                    15 of the Act (15 U.S.C.78o).
                  (b)      [ ]      Bank as defined in section 3(a)(6) of the
                                    Act (15 U.S.C. 78c).
                  (c)      [ ]      Insurance company as defined in section 3(a)
                                    (19) of the Act (15 U.S.C. 78c).
                  (d)      [ ]      Investment company as registered under
                                    Section 8 of the Investment Company Act of
                                    1940 (15 U.S.C. 80a-8).
                  (e)      [ ]      An investment adviser in accordance with
                                    ss.240.13d-1(b)(1)(ii)(E).
                  (f)      [ ]      An employee benefit plan or endowment
                                    fund  in accordance with
                                    ss.240.13d-1(b)(1)(ii)(F).
                  (g)      [ ]      A parent holding company or control
                                    person in accordance with
                                    ss.240.13d-1(b)(1)(ii)(G).
                  (h)      [ ]      A savings associations as defined in
                                    Section 3(b) of the Federal Deposit
                                    Insurance Act (12 U.S.C. 1813).
                  (i)      [ ]      A church plan that is excluded from the
                                    definition of an investment company under
                                    section 3(c)(14) of the Investment Company
                                    Act of 1940 (15 U.S.C. 80a-3).
                  (j)      [ ]      Group, in accordance with
                                    ss.240.13d-1(b)(1)(ii)(J).

                                  Page 4 of 7


ITEM 4.           OWNERSHIP.
1.                Eli Oxenhorn:
                  (a)      Amount Beneficially Owned: 2,990,577(1,2,3) shares.
                  (b)      Percent of Class:       6.3%
                  (c)      Number of shares as to which such person has:
                           (i)    sole power to vote or to direct the vote:
                                  2,749,500(1) shares.
                           (ii)   shared power to vote or to direct the vote:
                                  241,077(2,3) shares.
                           (iii)  sole power to dispose or to direct the
                                  disposition of: 2,749,500(1) shares.
                           (iv)   shared power to dispose or to direct the
                                  disposition of: 241,077(2,3) shares.

2.                Eli Oxenhorn Family Limited Partnership:
                  (a)      Amount Beneficially Owned: 241,077(2) shares. Eli
                           Oxenhorn is the general partner of the Eli Oxenhorn
                           Family Limited Partnership.
                  (b)      Percent of Class:       0.5%
                  (c)      Number of shares as to which such person has:
                           (i)    sole power to vote or to direct the vote:
                                  241,077(2) shares.
                           (ii)   shared power to vote or to direct the vote:
                                  0 shares.
                           (iii)  sole power to dispose or to direct the
                                  disposition of: 241,077(2) shares.
                           (iv)   shared power to dispose or to direct the
                                  disposition of: 0 shares.

                  Exhibit A, a Joint Filing  Agreement,  was previously  filed
                  with a Schedule 13G, dated August 22, 2001.

ITEM 5.           OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

                  If this statement is being filed to report the fact that as of
the date hereof the reporting person has ceased to be the beneficial owner of
more than five percent of the class of securities, check the following. [ ]

INSTRUCTION:      Dissolution of a group requires a response to this item.

ITEM 6.           OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER
                  PERSON.

                  Not Applicable.

ITEM 7.           IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
                  ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT
                  HOLDING COMPANY.

                  Not Applicable.




-------------------------
(1)Consists of 2,738,000 shares of Common Stock held by Mr. Oxenhorn, 3,500
shares held by the Eli Oxenhorn SEP IRA Account, and 8,000 shares held by the
Eli Oxenhorn Rollover IRA.
(2)Consists of 241,077 shares of Common Stock held by the Eli Oxenhorn Family
Limited Partnership.
(3)The reporting person disclaims beneficial ownership of these securities
except to the extent of his equity interest therein.


                                  Page 5 of 7



ITEM 8.           IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

                  Not Applicable.

ITEM 9.           NOTICE OF DISSOLUTION OF GROUP.

                  Not Applicable.

ITEM 10.          CERTIFICATION.

                       By signing below each party  certifies  that, to the best
                       of his/its knowledge and belief, the securities  referred
                       to  above  were  not  acquired  and are not  held for the
                       purpose of or with the effect of changing or  influencing
                       the control of the issuer of the  securities and were not
                       acquired  and are not  held  in  connection  with or as a
                       participant  in any  transaction  having that  purpose or
                       effect.

                                  Page 6 of 7


                                    SIGNATURE

         After reasonable inquiry and to the best of their knowledge and belief,
each of the undersigned hereby certifies that the information set forth in this
statement is true, complete and correct.

Dated:  January 17, 2006


                                   /s/ Eli Oxenhorn
                                   ---------------------------------------------
                                       Eli Oxenhorn


                                   ELI OXENHORN FAMILY LIMITED PARTNERSHIP



                                   By:/s/ Eli Oxenhorn
                                      ------------------------------------------
                                      Name: Eli Oxenhorn
                                      Title: General Partner

ATTENTION:        INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT CONSTITUTE
                  FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001)

                                  Page 7 of 7