diff --git a/libavcodec/flacdec.c b/libavcodec/flacdec.c
index 2d3e4b3f70..a0c950bdde 100644
--- a/libavcodec/flacdec.c
+++ b/libavcodec/flacdec.c
@@ -498,6 +498,7 @@ static int flac_decode_frame(AVCodecContext *avctx, void *data,
     int ret;
 
     *got_frame_ptr = 0;
+    s->avctx = avctx;
 
     if (s->max_framesize == 0) {
         s->max_framesize =