diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index 95ceca639f..5dd187d2b5 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -713,8 +713,8 @@ static int decode_init_thread_copy(AVCodecContext *avctx)
 
     if (!avctx->internal->is_copy)
         return 0;
-    memset(h->sps_buffers, 0, sizeof(h->sps_buffers));
-    memset(h->pps_buffers, 0, sizeof(h->pps_buffers));
+
+    memset(h, 0, sizeof(*h));
 
     ret = h264_init_context(avctx, h);
     if (ret < 0)