diff --git a/contrib/mkimage-alpine.sh b/contrib/mkimage-alpine.sh
index a271effaa6..03180e435a 100755
--- a/contrib/mkimage-alpine.sh
+++ b/contrib/mkimage-alpine.sh
@@ -47,7 +47,7 @@ pack() {
 }
 
 save() {
-	[ $SAVE -eq 1 ] || return
+	[ $SAVE -eq 1 ] || return 0
 
 	tar --numeric-owner -C $ROOTFS -c . | xz > rootfs.tar.xz
 }