diff --git a/abclib.dsp b/abclib.dsp
index dc59fcd6d..6a83a868e 100644
--- a/abclib.dsp
+++ b/abclib.dsp
@@ -2175,6 +2175,10 @@ SOURCE=.\src\misc\extra\extraBddSymm.c
 # End Source File
 # Begin Source File
 
+SOURCE=.\src\misc\extra\extraBddTime.c
+# End Source File
+# Begin Source File
+
 SOURCE=.\src\misc\extra\extraBddUnate.c
 # End Source File
 # Begin Source File