diff --git a/lib/synergy/libsynergy.dsp b/lib/synergy/libsynergy.dsp
index 890ec743..b53b957d 100644
--- a/lib/synergy/libsynergy.dsp
+++ b/lib/synergy/libsynergy.dsp
@@ -175,6 +175,10 @@ SOURCE=.\MouseTypes.h
 # End Source File
 # Begin Source File
 
+SOURCE=.\OptionTypes.h
+# End Source File
+# Begin Source File
+
 SOURCE=.\ProtocolTypes.h
 # End Source File
 # Begin Source File