diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index c0367d4ba2..fa93b75c88 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -1719,9 +1719,9 @@ static av_cold int decode_init(AVCodecContext *avctx)
 
     // allocate and assign channel data buffer for mcc mode
     if (sconf->mc_coding) {
-        ctx->chan_data_buffer  = av_malloc(sizeof(*ctx->chan_data_buffer) *
+        ctx->chan_data_buffer  = av_mallocz(sizeof(*ctx->chan_data_buffer) *
                                            num_buffers * num_buffers);
-        ctx->chan_data         = av_malloc(sizeof(*ctx->chan_data) *
+        ctx->chan_data         = av_mallocz(sizeof(*ctx->chan_data) *
                                            num_buffers);
         ctx->reverted_channels = av_malloc(sizeof(*ctx->reverted_channels) *
                                            num_buffers);