diff --git a/src/GvimExt/Makefile b/src/GvimExt/Makefile
index 5c598c1..16b1734 100644
--- a/src/GvimExt/Makefile
+++ b/src/GvimExt/Makefile
@@ -4,7 +4,9 @@
 #
 
 TARGETOS=BOTH
-APPVER=4.0
+!ifndef APPVER
+APPVER=5.0
+!endif
 
 !if "$(DEBUG)" != "yes"
 NODEBUG = 1