diff --git a/libavcodec/cook.c b/libavcodec/cook.c
index df85c7d431..923c8e3756 100644
--- a/libavcodec/cook.c
+++ b/libavcodec/cook.c
@@ -1010,7 +1010,7 @@ static int cook_decode_frame(AVCodecContext *avctx,
 
     for(i=1;i<q->num_subpackets;i++){
         q->subpacket[i].size = 2 * buf[avctx->block_align - q->num_subpackets + i];
-        q->subpacket[0].size -= (q->subpacket[i].size + 1);
+        q->subpacket[0].size -= q->subpacket[i].size + 1;
     }
 
     /* decode supbackets */