diff --git a/reactos/drivers/dd/serial/devctrl.c b/reactos/drivers/dd/serial/devctrl.c
index ad88cd198db..163710f8946 100644
--- a/reactos/drivers/dd/serial/devctrl.c
+++ b/reactos/drivers/dd/serial/devctrl.c
@@ -201,9 +201,11 @@ BOOLEAN
 SerialGetPerfStats(IN PIRP pIrp)
 {
 	PSERIAL_DEVICE_EXTENSION pDeviceExtension;
+	
+	ASSERT(Irp);
 	pDeviceExtension = (PSERIAL_DEVICE_EXTENSION)
 		IoGetCurrentIrpStackLocation(pIrp)->DeviceObject->DeviceExtension;
-	ASSERT(DeviceExtension);
+	
 	/*
 	 * we assume buffer is big enough to hold SerialPerfStats structure
 	 * caller must verify this
diff --git a/reactos/drivers/dd/serial/pnp.c b/reactos/drivers/dd/serial/pnp.c
index 70417d69986..4fe8dec53cf 100644
--- a/reactos/drivers/dd/serial/pnp.c
+++ b/reactos/drivers/dd/serial/pnp.c
@@ -31,7 +31,7 @@ SerialAddDeviceInternal(
 
 	DPRINT("Serial: SerialAddDeviceInternal called\n");
 
-	ASSERT(DeviceObject);
+	ASSERT(DriverObject);
 	ASSERT(Pdo);
 
 	/* Create new device object */