diff --git a/test/cmocka/src/audio/volume/volume_process.c b/test/cmocka/src/audio/volume/volume_process.c
index 7b50fde2f..89a789d62 100644
--- a/test/cmocka/src/audio/volume/volume_process.c
+++ b/test/cmocka/src/audio/volume/volume_process.c
@@ -278,8 +278,9 @@ static void test_audio_vol(void **state)
 	case SOF_IPC_FRAME_FLOAT:
 		fill_source_s32(vol_state);
 		break;
-	case SOF_IPC_FRAME_S24_3LE:
-		/* TODO: add 3LE support */
+
+	/* TODO: add 3LE support */
+	default:
 		break;
 	}