diff --git a/hal/voice.c b/hal/voice.c
index b3645be..f9e3562 100644
--- a/hal/voice.c
+++ b/hal/voice.c
@@ -216,8 +216,16 @@
 
     uc_info->id = usecase_id;
     uc_info->type = VOICE_CALL;
-    uc_info->stream.out = adev->current_call_output ;
-    uc_info->devices = adev->current_call_output ->devices;
+    uc_info->stream.out = adev->current_call_output;
+    uc_info->devices = adev->current_call_output->devices;
+
+    if (popcount(uc_info->devices) == 2) {
+        ALOGE("%s: Invalid combo device(%#x) for voice call", __func__,
+              uc_info->devices);
+        ret = -EIO;
+        goto error_start_voice;
+    }
+
     uc_info->in_snd_device = SND_DEVICE_NONE;
     uc_info->out_snd_device = SND_DEVICE_NONE;