diff --git a/ext/alsa/gstalsamidisrc.c b/ext/alsa/gstalsamidisrc.c
index 31227c8dcb..1538c8bb64 100644
--- a/ext/alsa/gstalsamidisrc.c
+++ b/ext/alsa/gstalsamidisrc.c
@@ -322,8 +322,6 @@ prepare_buffer (GstAlsaMidiSrc * alsamidisrc, gpointer data, guint size)
 
   GST_BUFFER_DTS (buffer) = time;
   GST_BUFFER_PTS (buffer) = time;
-  GST_BUFFER_OFFSET (buffer) = time;
-  GST_BUFFER_DURATION (buffer) = MIDI_TICK_PERIOD_MS * GST_MSECOND;
 
   local_data = g_memdup (data, size);