diff --git a/src/msw/makefile.vc b/src/msw/makefile.vc
index 908f09f85b..667f7b3799 100644
--- a/src/msw/makefile.vc
+++ b/src/msw/makefile.vc
@@ -219,6 +219,7 @@ MSWOBJS = \
   $(MSWDIR)\textctrl.obj \
   $(MSWDIR)\thread.obj \
   $(MSWDIR)\timer.obj \
+  $(MSWDIR)\tooltip.obj \
   $(MSWDIR)\treectrl.obj \
   $(MSWDIR)\utils.obj \
   $(MSWDIR)\utilsexc.obj \