diff --git a/reactos/drivers/input/sermouse/detect.c b/reactos/drivers/input/sermouse/detect.c
index dfa1ae77fb2..dbb3a63df05 100644
--- a/reactos/drivers/input/sermouse/detect.c
+++ b/reactos/drivers/input/sermouse/detect.c
@@ -160,7 +160,7 @@ SermouseDetectLegacyDevice(
 	ULONG Command;
 	SERIAL_TIMEOUTS Timeouts;
 	SERIAL_LINE_CONTROL LCR;
-	ULONG i, Count;
+	ULONG i, Count = 0;
 	UCHAR Buffer[16];
 	SERMOUSE_MOUSE_TYPE MouseType = mtNone;
 	NTSTATUS Status;
diff --git a/reactos/drivers/input/sermouse/internaldevctl.c b/reactos/drivers/input/sermouse/internaldevctl.c
index 90e1b8cd895..b706b955604 100644
--- a/reactos/drivers/input/sermouse/internaldevctl.c
+++ b/reactos/drivers/input/sermouse/internaldevctl.c
@@ -49,6 +49,7 @@ SermouseInternalDeviceControl(
 
 			/* Ask read loop to end */
 			KeSetEvent(&DeviceExtension->StopWorkerThreadEvent, (KPRIORITY)0, FALSE);
+			Status = STATUS_SUCCESS;
 			break;
 		}
 		case IOCTL_MOUSE_QUERY_ATTRIBUTES: