diff --git a/ProtobufInspector/FiddlerApp.cs b/ProtobufInspector/FiddlerApp.cs
index 86b6b6e..455425c 100755
--- a/ProtobufInspector/FiddlerApp.cs
+++ b/ProtobufInspector/FiddlerApp.cs
@@ -23,7 +23,7 @@ public static bool IsProtobufPacket(HTTPHeaders headers)
                 return false;
             }
             
-            return null != headers && (headers.ExistsAndContains("Content-Type", "application/x-protobuf") || headers.ExistsAndContains("Content-Type", "application/x-google-protobuf"));
+            return null != headers && (headers.ExistsAndContains("Content-Type", "application/x-protobuf") || headers.ExistsAndContains("Content-Type", "application/x-google-protobuf") || headers.ExistsAndContains("Content-Type", "application/protobuf"));
         }
         
         public static byte[] DecodeContent(byte[] body, Fiddler.HTTPHeaders headers)