diff --git a/libavcodec/pngenc.c b/libavcodec/pngenc.c
index 8ef863a6c1..c86cf5a862 100644
--- a/libavcodec/pngenc.c
+++ b/libavcodec/pngenc.c
@@ -1056,7 +1056,7 @@ static int encode_apng(AVCodecContext *avctx, AVPacket *pkt,
         }
 
         av_frame_unref(s->last_frame);
-        ret = av_frame_ref(s->last_frame, (AVFrame*)pict);
+        ret = av_frame_ref(s->last_frame, pict);
         if (ret < 0)
             return ret;