diff --git a/ext/libpng/gstpngdec.c b/ext/libpng/gstpngdec.c
index f51c91af99..0608449e0f 100644
--- a/ext/libpng/gstpngdec.c
+++ b/ext/libpng/gstpngdec.c
@@ -413,6 +413,8 @@ gst_pngdec_parse (GstVideoDecoder * decoder, GstVideoCodecFrame * frame,
   guint64 signature;
   gsize size;
 
+  GST_VIDEO_CODEC_FRAME_SET_SYNC_POINT (frame);
+
   /* FIXME : The overhead of using scan_uint32 is massive */
 
   size = gst_adapter_available (adapter);