diff --git a/libavcodec/vb.c b/libavcodec/vb.c
index 042ca56c25b532db12d62a5713517ffe89de621a..f4f2ee1bfc5767b05f644845df48c91a7a4dca5f 100644
--- a/libavcodec/vb.c
+++ b/libavcodec/vb.c
@@ -269,8 +269,8 @@ static av_cold int decode_init(AVCodecContext *avctx)
     c->avctx = avctx;
     avctx->pix_fmt = PIX_FMT_PAL8;
 
-    c->frame      = av_malloc( avctx->width * avctx->height);
-    c->prev_frame = av_malloc( avctx->width * avctx->height);
+    c->frame      = av_mallocz(avctx->width * avctx->height);
+    c->prev_frame = av_mallocz(avctx->width * avctx->height);
 
     memset(c->pal, 0, sizeof(c->pal));