diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c
index 4f7280b6d3..d82756b62f 100644
--- a/libavcodec/libx264.c
+++ b/libavcodec/libx264.c
@@ -124,6 +124,8 @@ X264_close(AVCodecContext *avctx)
 {
     X264Context *x4 = avctx->priv_data;
 
+    av_freep(&avctx->extradata);
+
     if(x4->enc)
         x264_encoder_close(x4->enc);