diff --git a/lib/vquic/ngtcp2.c b/lib/vquic/ngtcp2.c
index 38bea45202..0409457910 100644
--- a/lib/vquic/ngtcp2.c
+++ b/lib/vquic/ngtcp2.c
@@ -1946,6 +1946,15 @@ static CURLcode ng_flush_egress(struct connectdata *conn, int sockfd,
             return CURLE_SEND_ERROR;
           }
         }
+        else if(ndatalen > 0) {
+          rv = nghttp3_conn_add_write_offset(qs->h3conn, stream_id, ndatalen);
+          if(rv != 0) {
+            failf(conn->data,
+                  "nghttp3_conn_add_write_offset returned error: %s\n",
+                  nghttp3_strerror(rv));
+            return CURLE_SEND_ERROR;
+          }
+        }
       }
     }
     if(outlen < 0) {