1 files changed, 4 insertions, 1 deletions
diff --git a/apkgrel.in b/apkgrel.in
index 83c89fd..7e33e34 100644
--- a/apkgrel.in
+++ b/apkgrel.in
@@ -49,7 +49,10 @@ do_add () {
 			&& continue
 		[ -d "$f" ] && f="$f/APKBUILD"
 		old=$(show_plain "$f")
-		setto=$(($old + 1))
+		case $old in
+		[0-9]*) setto=$((old + 1));;
+		*) setto=0;;
+		esac
 		do_set "$f" || return 1
 	done
 }