diff --git a/accept.go b/accept.go
index 6c63e730b226da8a19cdc192b65349b75d59b89c..15e14285ba12f5b65debe471637ea953359914a9 100644
--- a/accept.go
+++ b/accept.go
@@ -265,6 +265,8 @@ func acceptDeflate(w http.ResponseWriter, ext websocketExtension, mode Compressi
 		case "server_no_context_takeover":
 			copts.serverNoContextTakeover = true
 			continue
+		case "server_max_window_bits=15":
+			continue
 		}
 
 		if strings.HasPrefix(p, "client_max_window_bits") {