diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index b2785de240..857a949e98 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -1642,6 +1642,7 @@ static int decode_init_thread_copy(AVCodecContext *avctx)
     memset(h->sps_buffers, 0, sizeof(h->sps_buffers));
     memset(h->pps_buffers, 0, sizeof(h->pps_buffers));
 
+    h->avctx               = avctx;
     h->rbsp_buffer[0]      = NULL;
     h->rbsp_buffer[1]      = NULL;
     h->rbsp_buffer_size[0] = 0;