diff --git a/lib/transports/websocket.js b/lib/transports/websocket.js
index 7e5193e64..c9a82cb95 100644
--- a/lib/transports/websocket.js
+++ b/lib/transports/websocket.js
@@ -161,10 +161,10 @@ class WS extends Transport {
         if (lastPacket) {
           // fake drain
           // defer to next tick to allow Socket to clear writeBuffer
-          setTimeout(() => {
+          Promise.resolve().then(() => {
             this.writable = true;
             this.emit("drain");
-          }, 0);
+          });
         }
       });
     }