diff --git a/lib/kunit/device.c b/lib/kunit/device.c
index f5371287b3750f0cefdc423748846b4257d8d14a..074c6dd2e36a7d9e8154a604db7c2a8e4f669921 100644
--- a/lib/kunit/device.c
+++ b/lib/kunit/device.c
@@ -45,8 +45,8 @@ int kunit_bus_init(void)
 	int error;
 
 	kunit_bus_device = root_device_register("kunit");
-	if (!kunit_bus_device)
-		return -ENOMEM;
+	if (IS_ERR(kunit_bus_device))
+		return PTR_ERR(kunit_bus_device);
 
 	error = bus_register(&kunit_bus_type);
 	if (error)