diff --git a/src/event/quic/ngx_event_quic.c b/src/event/quic/ngx_event_quic.c
index 2a51c79a7..66f63fe0e 100644
--- a/src/event/quic/ngx_event_quic.c
+++ b/src/event/quic/ngx_event_quic.c
@@ -1092,7 +1092,6 @@ ngx_quic_discard_ctx(ngx_connection_t *c, enum ssl_encryption_level_t level)
         ngx_queue_remove(q);
 
         f = ngx_queue_data(q, ngx_quic_frame_t, queue);
-        ngx_quic_congestion_ack(c, f);
         ngx_quic_free_frame(c, f);
     }