diff --git a/win/makefile.vc b/win/makefile.vc
--- a/win/makefile.vc
+++ b/win/makefile.vc
@@ -886,7 +886,7 @@ $(ROOT)\manifest.uuid:
 	git rev-parse HEAD >>$(ROOT)\manifest.uuid
 
 $(TMP_DIR)\tclUuid.h:	$(ROOT)\manifest.uuid
-	copy $(WIN_DIR)\tclUuid.h.in+$(ROOT)\manifest.uuid $(TMP_DIR)\tclUuid.h
+	copy /b $(WIN_DIR)\tclUuid.h.in+$(ROOT)\manifest.uuid $(TMP_DIR)\tclUuid.h
 
 $(TMP_DIR)\tclEvent.obj: $(GENERICDIR)\tclEvent.c $(TMP_DIR)\tclUuid.h
 	$(cc32) $(pkgcflags) -I$(COMPATDIR)\zlib -I$(TMP_DIR) \