diff --git a/libraries/libldap/libldap.dsp b/libraries/libldap/libldap.dsp
index 9f4c754384..9b3d47b98d 100644
--- a/libraries/libldap/libldap.dsp
+++ b/libraries/libldap/libldap.dsp
@@ -232,6 +232,10 @@ SOURCE=..\..\include\srchpref.h
 # End Source File
 # Begin Source File
 
+SOURCE=.\strdup.c
+# End Source File
+# Begin Source File
+
 SOURCE=.\ufn.c
 # End Source File
 # Begin Source File