diff --git a/reactos/drivers/usb/nt4compat/usbdriver/dmgrdisp.c b/reactos/drivers/usb/nt4compat/usbdriver/dmgrdisp.c
index 8aaf8d00684..e24b49821fe 100644
--- a/reactos/drivers/usb/nt4compat/usbdriver/dmgrdisp.c
+++ b/reactos/drivers/usb/nt4compat/usbdriver/dmgrdisp.c
@@ -144,7 +144,8 @@ dev_mgr_dispatch(IN PUSB_DEV_MANAGER dev_mgr, IN PIRP irp)
     ULONG ctrl_code;
     USE_NON_PENDING_IRQL;
 
-    if (dev_mgr == NULL || irp == NULL)
+    ASSERT(irp);
+    if (dev_mgr == NULL)
     {
         EXIT_DISPATCH(STATUS_INVALID_PARAMETER, irp);
     }