diff --git a/pkg/filters/proxies/httpproxy/wspool.go b/pkg/filters/proxies/httpproxy/wspool.go
index 5fffa26c4a..35a4a9ce49 100644
--- a/pkg/filters/proxies/httpproxy/wspool.go
+++ b/pkg/filters/proxies/httpproxy/wspool.go
@@ -189,6 +189,10 @@ func (sp *WebSocketServerPool) handle(ctx *context.Context) (result string) {
 		InsecureSkipVerify: sp.spec.InsecureSkipVerify,
 		OriginPatterns:     sp.spec.OriginPatterns,
 	}
+	subProtocol := req.HTTPHeader().Get("Sec-WebSocket-Protocol")
+	if subProtocol != "" {
+		opts.Subprotocols = []string{subProtocol}
+	}
 	clntConn, err := websocket.Accept(stdw, req.Std(), opts)
 	if err != nil {
 		logger.Errorf("%s: failed to establish client connection: %v", sp.Name, err)