diff --git a/src/CookieBanner.js b/src/CookieBanner.js
index 2234a71..cc615bf 100644
--- a/src/CookieBanner.js
+++ b/src/CookieBanner.js
@@ -106,7 +106,7 @@ const CookieBanner = React.createClass({
   },
 
   acceptsCookies() {
-    return cookie(this.props.cookie) ? true : false;
+    return (typeof window !== 'undefined') && cookie(this.props.cookie);
   },
 
   render() {