diff --git a/abuild.in b/abuild.in
index 2cf61b8..2ba0f4b 100644
--- a/abuild.in
+++ b/abuild.in
@@ -1012,11 +1012,11 @@ prepare_metafiles() {
 		done
 	fi
 
-	# store last_commit in global var so we only call git once
-	if [ -z "$last_commit" ]; then
-		last_commit="$(git_last_commit)$(git_dirty)"
+	# store ABUILD_LAST_COMMIT in global var so we only call git once
+	if [ -z "$ABUILD_LAST_COMMIT" ]; then
+		ABUILD_LAST_COMMIT="$(git_last_commit)$(git_dirty)"
 	fi
-	echo "commit = $last_commit" >> "$pkginfo"
+	echo "commit = $ABUILD_LAST_COMMIT" >> "$pkginfo"
 
 	get_maintainer
 	if [ -n "$maintainer" ]; then