diff --git a/modules/hero.js b/modules/hero.js
index 0d881d8..b8b3159 100644
--- a/modules/hero.js
+++ b/modules/hero.js
@@ -1,4 +1,4 @@
-var raf = (typeof window !== `undefined` && window.requestAnimationFrame) || setTimeout;
+var raf = (typeof window !== 'undefined' && window.requestAnimationFrame) || setTimeout;
 var nextFrame = function(fn) { raf(function() { raf(fn); }); };
 
 function setNextFrame(obj, prop, val) {
diff --git a/modules/style.js b/modules/style.js
index 31ae880..8f525ff 100644
--- a/modules/style.js
+++ b/modules/style.js
@@ -1,4 +1,4 @@
-var raf = (typeof window !== `undefined` && window.requestAnimationFrame) || setTimeout;
+var raf = (typeof window !== 'undefined' && window.requestAnimationFrame) || setTimeout;
 var nextFrame = function(fn) { raf(function() { raf(fn); }); };
 
 function setNextFrame(obj, prop, val) {