diff --git a/cpp/test/primary_device_test.cpp b/cpp/test/primary_device_test.cpp
index 7ad6070e..aa259860 100644
--- a/cpp/test/primary_device_test.cpp
+++ b/cpp/test/primary_device_test.cpp
@@ -167,17 +167,17 @@ TEST(PrimaryDeviceTest, ModeSelect)
 TEST(PrimaryDeviceTest, ModeSense6)
 {
     MockPrimaryDevice device(0);
-    vector<uint8_t> v;
+    vector<uint8_t> buf;
 
-    EXPECT_EQ(0, device.ModeSense6( { }, v));
+    EXPECT_EQ(0, device.ModeSense6( { }, buf));
 }
 
 TEST(PrimaryDeviceTest, ModeSense10)
 {
     MockPrimaryDevice device(0);
-    vector<uint8_t> v;
+    vector<uint8_t> buf;
 
-    EXPECT_EQ(0, device.ModeSense10( { }, v));
+    EXPECT_EQ(0, device.ModeSense10( { }, buf));
 }
 
 TEST(PrimaryDeviceTest, TestUnitReady)