diff --git a/libavcodec/hapenc.c b/libavcodec/hapenc.c
index 39c1c5afac..7daadce254 100644
--- a/libavcodec/hapenc.c
+++ b/libavcodec/hapenc.c
@@ -196,7 +196,7 @@ static int hap_encode(AVCodecContext *avctx, AVPacket *pkt,
     int pktsize = FFMAX(ctx->tex_size, ctx->max_snappy * ctx->chunk_count) + header_length;
 
     /* Allocate maximum size packet, shrink later. */
-    ret = ff_alloc_packet(pkt, pktsize);
+    ret = ff_alloc_packet2(avctx, pkt, pktsize, header_length);
     if (ret < 0)
         return ret;