diff --git a/src/WebApiContrib.Formatting.Jsonp/JsonpMediaTypeFormatter.cs b/src/WebApiContrib.Formatting.Jsonp/JsonpMediaTypeFormatter.cs
index 307d6b3..80ea4b5 100644
--- a/src/WebApiContrib.Formatting.Jsonp/JsonpMediaTypeFormatter.cs
+++ b/src/WebApiContrib.Formatting.Jsonp/JsonpMediaTypeFormatter.cs
@@ -101,7 +101,7 @@ public override MediaTypeFormatter GetPerRequestFormatterInstance(Type type, Htt
                 return new JsonpMediaTypeFormatter(request, callback, _jsonMediaTypeFormatter, _callbackQueryParameter);
             }
 
-            throw new InvalidOperationException(Properties.Resources.NoCallback);
+            return new JsonpMediaTypeFormatter(_jsonMediaTypeFormatter);
         }
 
         /// <summary>