diff --git a/sys/applemedia/vtdec.c b/sys/applemedia/vtdec.c
index 86df2ab561..82a656c5fb 100644
--- a/sys/applemedia/vtdec.c
+++ b/sys/applemedia/vtdec.c
@@ -359,7 +359,7 @@ gst_vtdec_set_format (GstVideoDecoder * decoder, GstVideoCodecState * state)
     gst_video_codec_state_unref (vtdec->input_state);
   vtdec->input_state = gst_video_codec_state_ref (state);
 
-  return TRUE;
+  return gst_video_decoder_negotiate (decoder);
 }
 
 static gboolean