diff --git a/src/stream.ts b/src/stream.ts
index 7e17922..f7a78f0 100644
--- a/src/stream.ts
+++ b/src/stream.ts
@@ -269,6 +269,11 @@ export class YamuxStream extends AbstractStream {
    * potentially sends a window update enabling further writes to take place.
    */
   sendWindowUpdate (): void {
+    // only send window updates if the read status is ready
+    if (this.readStatus !== 'ready') {
+      return
+    }
+
     // determine the flags if any
     const flags = this.getSendFlags()