diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c
index 85f1996ab6..c8f2380d8e 100644
--- a/libavcodec/libx264.c
+++ b/libavcodec/libx264.c
@@ -276,7 +276,6 @@ static int X264_frame(AVCodecContext *ctx, AVPacket *pkt, const AVFrame *frame,
     int nnal, i, ret;
     x264_picture_t pic_out = {0};
     int pict_type;
-    AVFrameSideData *side_data;
 
     x264_picture_init( &x4->pic );
     x4->pic.img.i_csp   = x4->params.i_csp;