diff --git a/reactos/drivers/dd/serial/devctrl.c b/reactos/drivers/dd/serial/devctrl.c
index 163710f8946..1be38a9deba 100644
--- a/reactos/drivers/dd/serial/devctrl.c
+++ b/reactos/drivers/dd/serial/devctrl.c
@@ -202,7 +202,7 @@ SerialGetPerfStats(IN PIRP pIrp)
 {
 	PSERIAL_DEVICE_EXTENSION pDeviceExtension;
 	
-	ASSERT(Irp);
+	ASSERT(pIrp);
 	pDeviceExtension = (PSERIAL_DEVICE_EXTENSION)
 		IoGetCurrentIrpStackLocation(pIrp)->DeviceObject->DeviceExtension;