diff --git a/demo/usage.html b/demo/usage.html
index a3ffe8e..7c62396 100644
--- a/demo/usage.html
+++ b/demo/usage.html
@@ -80,7 +80,7 @@ <h1>VividCortex reCaptcha Directive Example</h1>
         <form ng-submit="submit()">
             <div
                 vc-recaptcha
-                theme="light"
+                theme="'light'"
                 key="model.key"
                 on-create="setWidgetId(widgetId)"
                 on-success="setResponse(response)"
diff --git a/src/directive.js b/src/directive.js
index bab7968..53994f2 100644
--- a/src/directive.js
+++ b/src/directive.js
@@ -16,7 +16,7 @@
             scope: {
                 response: '=?ngModel',
                 key: '=',
-                theme: '?=',
+                theme: '=?',
                 onCreate: '&',
                 onSuccess: '&',
                 onExpire: '&'