diff --git a/install-compiled.sh b/install-compiled.sh
index 3e2929a..933b92a 100755
--- a/install-compiled.sh
+++ b/install-compiled.sh
@@ -275,7 +275,7 @@ process_conf() {
         all_apps[$idx]="$app"; all_git[$idx]="$git_url"; all_wget[$idx]="$wget_url"
         all_install[$idx]="$install_path"; all_steps[$idx]="$steps"
         all_versions[$idx]="$version"; all_desktops[$idx]="$desktop"; all_guis[$idx]="$gui"
-        ((idx++))
+        idx=$((idx + 1))
       fi
       app="${BASH_REMATCH[1]}"
       git_url="" wget_url="" install_path="" steps="" version="" desktop="" gui=""