diff --git a/lib/request-handler.js b/lib/request-handler.js
index 0e62eb9..f8e0a58 100644
--- a/lib/request-handler.js
+++ b/lib/request-handler.js
@@ -152,7 +152,7 @@ RequestHandler.prototype._afterResize = function(err, path, res, callback) {
   } else {
     this.logger.log('Sending processed image')
 
-    res.contentType(path.replace(/\?(.*)/, ""))
+    res.contentType(path.match(/\.[0-9a-z]+$/i)[0])
     res.sendfile(path, { maxAge: oneYear }, function() {
       self.logger.log('File sent')