diff --git a/lib/vquic/ngtcp2.c b/lib/vquic/ngtcp2.c
index 5e72be2ab0..63c83584e6 100644
--- a/lib/vquic/ngtcp2.c
+++ b/lib/vquic/ngtcp2.c
@@ -1865,6 +1865,7 @@ void Curl_quic_done(struct Curl_easy *data, bool premature)
     /* only for HTTP/3 transfers */
     struct HTTP *stream = data->req.p.http;
     Curl_dyn_free(&stream->overflow);
+    free(stream->h3out);
   }
 }