diff --git a/libavcodec/motionpixels.c b/libavcodec/motionpixels.c
index f8aa08bcb6..470b1dc64d 100644
--- a/libavcodec/motionpixels.c
+++ b/libavcodec/motionpixels.c
@@ -275,13 +275,12 @@ static int mp_decode_frame(AVCodecContext *avctx,
         return ret;
 
     /* le32 bitstream msb first */
-    av_fast_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
+    av_fast_padded_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size);
     if (!mp->bswapbuf)
         return AVERROR(ENOMEM);
     mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4);
     if (buf_size & 3)
         memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
-    memset(mp->bswapbuf + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
     init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
 
     memset(mp->changes_map, 0, avctx->width * avctx->height);