diff --git a/plugins/winsys/makefile.mak b/plugins/winsys/makefile.mak
index d7d1e4a9..cb480ac0 100644
--- a/plugins/winsys/makefile.mak
+++ b/plugins/winsys/makefile.mak
@@ -1,15 +1,15 @@
 include "..\..\src\makeinc.mak"
 
 all: winsys.obj winsys.def
-	link $(LDFLAGS) $(LIBS) wbemuuid.lib /dll /out:xcwinsys.dll /def:winsys.def winsys.obj
+	link $(LDFLAGS) $(LIBS) /NODEFAULTLIB:comsupp.lib wbemuuid.lib vccomsup.lib /dll /out:xcwinsys.dll /def:winsys.def winsys.obj
 
 winsys.def:
 	echo EXPORTS > winsys.def
 	echo xchat_plugin_init >> winsys.def
 	echo xchat_plugin_deinit >> winsys.def
 
-winsys.obj: winsys.c makefile.mak
-	cl $(CFLAGS) $(GLIB) /Zc:wchar_t- /I.. winsys.c
+winsys.obj: winsys.cpp makefile.mak
+	cl $(CFLAGS) $(GLIB) /Zc:wchar_t- /I.. winsys.cpp
 
 clean:
 	del *.obj
diff --git a/plugins/winsys/winsys.c b/plugins/winsys/winsys.cpp
similarity index 100%
rename from plugins/winsys/winsys.c
rename to plugins/winsys/winsys.cpp