diff --git a/palera1n.sh b/palera1n.sh
index b1dff5b..cc96422 100755
--- a/palera1n.sh
+++ b/palera1n.sh
@@ -103,7 +103,7 @@ parse_opt() {
 }
 
 parse_arg() {
-    ((arg_count++))
+    arg_count=$((arg_count + 1))
     case "$1" in
         dfuhelper)
             dfuhelper=1