diff --git a/src/http/web_socket.cr b/src/http/web_socket.cr
index 850862efbc92..0b8472f9cb73 100644
--- a/src/http/web_socket.cr
+++ b/src/http/web_socket.cr
@@ -78,7 +78,7 @@ class HTTP::WebSocket
   end
 
   # Sends a message payload (message).
-  def send(message : String) : Nil
+  def send(message : String | Bytes) : Nil
     check_open
     @ws.send(message)
   end