diff --git a/libavformat/webpenc.c b/libavformat/webpenc.c
index d5edf89289..ed8325c02d 100644
--- a/libavformat/webpenc.c
+++ b/libavformat/webpenc.c
@@ -191,6 +191,13 @@ static int webp_write_trailer(AVFormatContext *s)
     return 0;
 }
 
+static void webp_deinit(AVFormatContext *s)
+{
+    WebpContext *w = s->priv_data;
+
+    av_packet_unref(&w->last_pkt);
+}
+
 #define OFFSET(x) offsetof(WebpContext, x)
 #define ENC AV_OPT_FLAG_ENCODING_PARAM
 static const AVOption options[] = {
@@ -214,6 +221,7 @@ AVOutputFormat ff_webp_muxer = {
     .init           = webp_init,
     .write_packet   = webp_write_packet,
     .write_trailer  = webp_write_trailer,
+    .deinit         = webp_deinit,
     .priv_class     = &webp_muxer_class,
     .flags          = AVFMT_VARIABLE_FPS,
 };