diff --git a/card.js b/card.js
index 81e9219..0924a81 100644
--- a/card.js
+++ b/card.js
@@ -354,7 +354,7 @@
 
     // Add back image for card
     if (backImage) {
-      var backgroundImage = 'background-image:url(' + backImage + ')';
+      var backgroundImage = "background-image:url('" + backImage + "')";
 
       styles.front += backgroundImage;
       styles.back += backgroundImage;