diff --git a/libavcodec/libmp3lame.c b/libavcodec/libmp3lame.c
index 04498d2271..d75183e9c0 100644
--- a/libavcodec/libmp3lame.c
+++ b/libavcodec/libmp3lame.c
@@ -86,7 +86,6 @@ static av_cold int MP3lame_encode_init(AVCodecContext *avctx)
 
         return AVERROR(ENOMEM);
     }
-    avctx->coded_frame->key_frame = 1;
 
     if(AV_SAMPLE_FMT_S32 == avctx->sample_fmt && s->stereo) {
         int nelem = 2 * avctx->frame_size;