diff --git a/src/quic/http3.cc b/src/quic/http3.cc
index efaf1959427058..ba4b5c9eb0ffec 100644
--- a/src/quic/http3.cc
+++ b/src/quic/http3.cc
@@ -375,6 +375,7 @@ class Http3ApplicationImpl final : public Session::Application {
     Debug(&session(),
           "HTTP/3 application extending max stream data to %" PRIu64,
           max_data);
+    stream->UpdateWriteDesiredSize();  // the stream might be blocked on js side
     nghttp3_conn_unblock_stream(*this, stream->id());
   }