diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index ac3198e4fd..d1ca2afb4b 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -688,7 +688,7 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
                     int buf_size3;
                     if (avctx->hwaccel)
                         buf_start_second_field = start;
-                    tmp = av_realloc_array(slices, sizeof(*slices), (n_slices+1));
+                    tmp = av_realloc_array(slices, sizeof(*slices), n_slices+1);
                     if (!tmp) {
                         ret = AVERROR(ENOMEM);
                         goto err;
@@ -717,7 +717,7 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
                     break;
                 case VC1_CODE_SLICE: {
                     int buf_size3;
-                    tmp = av_realloc_array(slices, sizeof(*slices), (n_slices+1));
+                    tmp = av_realloc_array(slices, sizeof(*slices), n_slices+1);
                     if (!tmp) {
                         ret = AVERROR(ENOMEM);
                         goto err;
@@ -752,7 +752,7 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
             } else { // found field marker, unescape second field
                 if (avctx->hwaccel)
                     buf_start_second_field = divider;
-                tmp = av_realloc_array(slices, sizeof(*slices), (n_slices+1));
+                tmp = av_realloc_array(slices, sizeof(*slices), n_slices+1);
                 if (!tmp) {
                     ret = AVERROR(ENOMEM);
                     goto err;