diff --git a/ext/opus/gstopusenc.c b/ext/opus/gstopusenc.c
index a926bbdb4c..c6604c2196 100644
--- a/ext/opus/gstopusenc.c
+++ b/ext/opus/gstopusenc.c
@@ -544,7 +544,7 @@ gst_opus_enc_setup (GstOpusEnc * enc)
 
   enc->state =
       opus_multistream_encoder_create (enc->sample_rate, enc->n_channels,
-      (enc->n_channels + 1) / 2, enc->n_channels / 2, trivial_mapping,
+      enc->n_channels, 0, trivial_mapping,
       enc->audio_or_voip ? OPUS_APPLICATION_AUDIO : OPUS_APPLICATION_VOIP,
       &error);
   if (!enc->state || error != OPUS_OK)
diff --git a/ext/opus/gstopusheader.c b/ext/opus/gstopusheader.c
index 1aa3b0d01b..42df7b35fb 100644
--- a/ext/opus/gstopusheader.c
+++ b/ext/opus/gstopusheader.c
@@ -44,8 +44,8 @@ gst_opus_enc_create_id_buffer (gint nchannels, gint sample_rate,
   gst_byte_writer_put_uint16_le (&bw, 0);       /* output gain */
   gst_byte_writer_put_uint8 (&bw, channel_mapping_family);
   if (channel_mapping_family > 0) {
-    gst_byte_writer_put_uint8 (&bw, (nchannels + 1) / 2);
-    gst_byte_writer_put_uint8 (&bw, nchannels / 2);
+    gst_byte_writer_put_uint8 (&bw, nchannels);
+    gst_byte_writer_put_uint8 (&bw, 0);
     gst_byte_writer_put_data (&bw, channel_mapping, nchannels);
   }