diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 7d9da5c106..48897d4998 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -1085,7 +1085,6 @@ static int init_context_frame(MpegEncContext *s)
     s->mb_width   = (s->width + 15) / 16;
     s->mb_stride  = s->mb_width + 1;
     s->b8_stride  = s->mb_width * 2 + 1;
-    s->b4_stride  = s->mb_width * 4 + 1;
     mb_array_size = s->mb_height * s->mb_stride;
     mv_table_size = (s->mb_height + 2) * s->mb_stride + 1;
 
diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h
index 959b927011..8f77db3946 100644
--- a/libavcodec/mpegvideo.h
+++ b/libavcodec/mpegvideo.h
@@ -253,7 +253,6 @@ typedef struct MpegEncContext {
     int mb_width, mb_height;   ///< number of MBs horizontally & vertically
     int mb_stride;             ///< mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11
     int b8_stride;             ///< 2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
-    int b4_stride;             ///< 4*mb_width+1 used for some 4x4 block arrays to allow simple addressing
     int h_edge_pos, v_edge_pos;///< horizontal / vertical position of the right/bottom edge (pixel replication)
     int mb_num;                ///< number of MBs of a picture
     ptrdiff_t linesize;        ///< line size, in bytes, may be different from width