diff --git a/gst-libs/gst/audio/audio-info.c b/gst-libs/gst/audio/audio-info.c
index 2cae7e1240..53cdd5b59b 100644
--- a/gst-libs/gst/audio/audio-info.c
+++ b/gst-libs/gst/audio/audio-info.c
@@ -131,6 +131,7 @@ gst_audio_info_set_format (GstAudioInfo * info, GstAudioFormat format,
   info->bpf = (finfo->width * channels) / 8;
 
   memset (&info->position, 0xff, sizeof (info->position));
+  memset (&info->_gst_reserved, 0xff, sizeof (info->_gst_reserved));
 
   if (!position && channels == 1) {
     info->position[0] = GST_AUDIO_CHANNEL_POSITION_MONO;
diff --git a/gst-libs/gst/video/video-info.c b/gst-libs/gst/video/video-info.c
index 6db2f664ba..8140228399 100644
--- a/gst-libs/gst/video/video-info.c
+++ b/gst-libs/gst/video/video-info.c
@@ -110,6 +110,7 @@ gst_video_info_set_format (GstVideoInfo * info, GstVideoFormat format,
   }
 
   fill_planes (info);
+  memset (&info->_gst_reserved, 0xff, sizeof (info->_gst_reserved));
 }
 
 static const gchar *interlace_mode[] = {