diff --git a/libavcodec/mpegvideo_enc.c b/libavcodec/mpegvideo_enc.c
index 8d7ffe5703..a5d3a06f55 100644
--- a/libavcodec/mpegvideo_enc.c
+++ b/libavcodec/mpegvideo_enc.c
@@ -1254,7 +1254,7 @@ static int load_input_picture(MpegEncContext *s, const AVFrame *pic_arg)
                         dst += INPLACE_OFFSET;
 
                     if (src_stride == dst_stride)
-                        memcpy(dst, src, src_stride * h);
+                        memcpy(dst, src, src_stride * h - src_stride + w);
                     else {
                         int h2 = h;
                         uint8_t *dst2 = dst;