diff --git a/src/emqttd_http.erl b/src/emqttd_http.erl
index 9cbc10a6f..9b50cf34a 100644
--- a/src/emqttd_http.erl
+++ b/src/emqttd_http.erl
@@ -90,7 +90,7 @@ check_protocol_header(Req) ->
     end.
 
 get_protocol_header(Req) ->
-    case Req:get_header_value("Emq-WebSocket-Protocol") of
+    case Req:get_header_value("EMQ-WebSocket-Protocol") of
         undefined -> Req:get_header_value("Sec-WebSocket-Protocol");
         Proto     -> Proto
     end.