diff --git a/reactos/drivers/usb/nt4compat/usbdriver/keyboard.c b/reactos/drivers/usb/nt4compat/usbdriver/keyboard.c
index 3e7102cc41f..4194dcf0655 100644
--- a/reactos/drivers/usb/nt4compat/usbdriver/keyboard.c
+++ b/reactos/drivers/usb/nt4compat/usbdriver/keyboard.c
@@ -277,7 +277,7 @@ kbd_irq(PURB purb, PVOID pcontext)
     }
 
     // Save old keyboard data
-    RtlCopyMemory(pdev_ext->kbd_old, data, sizeof(data));
+    RtlCopyMemory(pdev_ext->kbd_old, data, 8);
 
     // resubmit the urb
     status = usb_submit_urb(pdev_ext->dev_mgr, purb);