diff --git a/chapter07/Zero/Zero.cpp b/chapter07/Zero/Zero.cpp
index d357b55..8f873b4 100644
--- a/chapter07/Zero/Zero.cpp
+++ b/chapter07/Zero/Zero.cpp
@@ -124,11 +124,13 @@ NTSTATUS ZeroDeviceControl(PDEVICE_OBJECT, PIRP Irp) {
 			stats->TotalRead = g_TotalRead;
 			stats->TotalWritten = g_TotalWritten;
 			len = sizeof(ZeroStats);
+			status = STATUS_SUCCESS;
 			break;
 		}
 
 		case IOCTL_ZERO_CLEAR_STATS:
 			g_TotalRead = g_TotalWritten = 0;
+			status = STATUS_SUCCESS;
 			break;
 	}
 
diff --git a/ktl/ktl_test/Main.cpp b/ktl/ktl_test/Main.cpp
index 189745e..1e6fe35 100644
--- a/ktl/ktl_test/Main.cpp
+++ b/ktl/ktl_test/Main.cpp
@@ -24,7 +24,7 @@ extern "C" NTSTATUS DriverEntry(PDRIVER_OBJECT DriverObject, PUNICODE_STRING Reg
 
 void TestUnload(PDRIVER_OBJECT DriverObject) {
 	delete g_RegPath;
-	IoDeleteDevice(DriverObject->DeviceObject);
+	//IoDeleteDevice(DriverObject->DeviceObject);
 }
 
 NTSTATUS TestCreateClose(PDEVICE_OBJECT, PIRP Irp) {