diff --git a/src/js/utilJS.tw b/src/js/utilJS.tw
index 3c0fafa3e95e1b68bfddd46ad22477741be06ade..b1258a2583ea53121760cbb5020272693e930024 100644
--- a/src/js/utilJS.tw
+++ b/src/js/utilJS.tw
@@ -519,7 +519,7 @@ window.generateNewID = function generateNewID() {
 };
 
 window.arraySwap(array, a, b) {
-	const tmp = array[a]
-	array[b] = array[a]
-	array[a] = tmp
-}
+	const tmp = array[a];
+	array[b] = array[a];
+	array[a] = tmp;
+};