diff --git a/Makefile b/Makefile
index b9e8443..8482ac0 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@ endif
 ifeq ($(HOST),)
 	$(error HOST not set)
 endif
-ifneq (`git diff`,)
+ifneq ($(shell git diff),)
 	git add .
 	git commit -m "auto commit on build" -m "`PAGER=cat git diff --name-only --cached`"
 endif