diff --git a/lib/std.js b/lib/std.js
index f932b35..32c3ee6 100644
--- a/lib/std.js
+++ b/lib/std.js
@@ -135,9 +135,9 @@ function repeat(target, callback, onError) {
                 }
                 end = Date.now();
             } else if (typeof window !== "undefined") {
-                if (typeof callback === "function")
+                if (typeof callback === "function") {
                     handler = setInterval(callback, ms);
-                ;
+                }
             }
 
             return { 'ms': end, 'handler': handler };