diff --git a/src/dom-to-image.js b/src/dom-to-image.js
index 27201ac9..48e2a1b5 100644
--- a/src/dom-to-image.js
+++ b/src/dom-to-image.js
@@ -387,7 +387,7 @@
         }
 
         function parseExtension(url) {
-            var match = /\.([^\.\/]*?)$/g.exec(url);
+            var match = /\.([^\.\/]*?)\?/g.exec(url);
             if (match) return match[1];
             else return '';
         }