diff --git a/libavformat/webm_chunk.c b/libavformat/webm_chunk.c
index 8e032703fcea6478192846b867cfb4786f8fd8df..c7cc0b8ff32f0188df8e9413968146f86fb92b42 100644
--- a/libavformat/webm_chunk.c
+++ b/libavformat/webm_chunk.c
@@ -70,11 +70,6 @@ static int chunk_mux_init(AVFormatContext *s)
     oc->max_delay          = s->max_delay;
     av_dict_copy(&oc->metadata, s->metadata, 0);
 
-    oc->priv_data = av_mallocz(oc->oformat->priv_data_size);
-    if (!oc->priv_data) {
-        avio_close(oc->pb);
-        return AVERROR(ENOMEM);
-    }
     *(const AVClass**)oc->priv_data = oc->oformat->priv_class;
     av_opt_set_defaults(oc->priv_data);
     av_opt_set_int(oc->priv_data, "dash", 1, 0);