diff --git a/tools/fbq-add-source.sh b/tools/fbq-add-source.sh
index 6d08b50..ce044bb 100644
--- a/tools/fbq-add-source.sh
+++ b/tools/fbq-add-source.sh
@@ -228,7 +228,7 @@ cmd_remove() {
         local name
         name=$(yq e ".server.sources[] | select(.path == \"$p\") | .name // \"(unnamed)\"" "$config" 2>/dev/null || echo "(unnamed)")
         printf "  %2d)  %-20s  %s\n" "$i" "${name:-?}" "$p"
-        (( i++ ))
+        i=$(( i + 1 ))
     done
     echo ""
 
@@ -268,7 +268,7 @@ cmd_show() {
         ro=$(yq e ".server.sources[] | select(.path == \"$p\") | .config.readOnly // false" "$config" 2>/dev/null || echo "false")
         printf "  %-20s  %-35s  defaultEnabled=%-5s  readOnly=%s\n" \
             "${name}" "${p}" "${enabled}" "${ro}"
-        (( count++ ))
+        count=$(( count + 1 ))
     done < <(list_sources "$config")
 
     [[ "$count" -eq 0 ]] && warn "No sources found."
@@ -309,7 +309,7 @@ main() {
         echo "    1) Add source(s)"
         echo "    2) Remove a source"
         echo "    3) Show current sources"
-        echo "    4) Quit"
+        echo "    0) Quit"
         echo ""
         read -r -p "  Choice [1]: " action
         action="${action:-1}"
@@ -319,7 +319,7 @@ main() {
             1) cmd_add    "$install_dir" "$config" "$data_mount" ;;
             2) cmd_remove "$install_dir" "$config" ;;
             3) cmd_show   "$config" ;;
-            4|q|Q) break ;;
+            0|q|Q) break ;;
             *) warn "Invalid choice." ;;
         esac
         echo ""