diff --git a/reactos/sdk/include/reactos/drivers/usbport/usbmport.h b/reactos/sdk/include/reactos/drivers/usbport/usbmport.h
index 830ef1d20dd..d6c15101338 100644
--- a/reactos/sdk/include/reactos/drivers/usbport/usbmport.h
+++ b/reactos/sdk/include/reactos/drivers/usbport/usbmport.h
@@ -578,7 +578,7 @@ typedef struct _USBPORT_MINIPORT_INTERFACE {
   USBPORT_REGISTRATION_PACKET Packet;
 } USBPORT_MINIPORT_INTERFACE, *PUSBPORT_MINIPORT_INTERFACE;
 
-C_ASSERT(sizeof(USBPORT_MINIPORT_INTERFACE) == 332 + 3 * sizeof(PVOID));
+C_ASSERT(sizeof(USBPORT_MINIPORT_INTERFACE) == 328 + 2 * sizeof(PVOID));
 
 #define USBPORT_TRANSFER_DIRECTION_OUT  1 // From host to device
 typedef struct _USBPORT_ENDPOINT_PROPERTIES {