diff --git a/libavcodec/msrle.c b/libavcodec/msrle.c
index 8f1f25966b..b9531f34d7 100644
--- a/libavcodec/msrle.c
+++ b/libavcodec/msrle.c
@@ -107,7 +107,7 @@ static int msrle_decode_frame(AVCodecContext *avctx,
 
     /* FIXME how to correctly detect RLE ??? */
     if (avctx->height * istride == avpkt->size) { /* assume uncompressed */
-        int linesize = avctx->width * avctx->bits_per_coded_sample / 8;
+        int linesize = (avctx->width * avctx->bits_per_coded_sample + 7) / 8;
         uint8_t *ptr = s->frame.data[0];
         uint8_t *buf = avpkt->data + (avctx->height-1)*istride;
         int i, j;