diff --git a/src/shrpx_spdy_upstream.cc b/src/shrpx_spdy_upstream.cc
index bb30c0d..7b65695 100644
--- a/src/shrpx_spdy_upstream.cc
+++ b/src/shrpx_spdy_upstream.cc
@@ -192,9 +192,6 @@ void on_ctrl_recv_callback
     }
 
     downstream->add_request_header("host", host);
-    if(!get_config()->spdy_proxy) {
-      downstream->add_request_header("X-Forwarded-Spdy", "true");
-    }
 
     if(LOG_ENABLED(INFO)) {
       std::stringstream ss;