diff --git a/hal/audio_hw.c b/hal/audio_hw.c
index cae3e3b3..bb4db485 100644
--- a/hal/audio_hw.c
+++ b/hal/audio_hw.c
@@ -6637,8 +6637,7 @@ int adev_open_output_stream(struct audio_hw_device *dev,
         if (!voice_extn_is_compress_voip_supported()) {
             if (out->sample_rate == 8000 || out->sample_rate == 16000 ||
              out->sample_rate == 32000 || out->sample_rate == 48000) {
-                //FIXME: add support for MONO stream configuration when audioflinger mixer supports it
-                out->channel_mask = AUDIO_CHANNEL_OUT_STEREO;
+                out->channel_mask = AUDIO_CHANNEL_OUT_MONO;
                 out->usecase = USECASE_AUDIO_PLAYBACK_VOIP;
                 out->format = AUDIO_FORMAT_PCM_16_BIT;