diff --git a/src/core/util/util.js b/src/core/util/util.js
index 1b563cc56f..53d4e083da 100644
--- a/src/core/util/util.js
+++ b/src/core/util/util.js
@@ -77,7 +77,7 @@ angular.module('material.core')
         var args = arguments;
         var now = Util.now();
 
-        if (!recent || recent - now > delay) {
+        if (!recent || (now - recent > delay)) {
           func.apply(context, args);
           recent = now;
         }