diff --git a/reactos/hal/halx86/xbox/halxbox.xml b/reactos/hal/halx86/xbox/halxbox.xml
index 7543c045e3c..e24fe194332 100644
--- a/reactos/hal/halx86/xbox/halxbox.xml
+++ b/reactos/hal/halx86/xbox/halxbox.xml
@@ -4,7 +4,8 @@
 	<include base="ntoskrnl">include</include>
 	<define name="_DISABLE_TIDENTS" />
 	<define name="UP" />
-	<define name="__NTHAL__" />
+	<define name="_NTHAL_" />
+	<define name="__USE_W32API" />
 	<library>hal_generic</library>
 	<library>hal_generic_up</library>
 	<library>ntoskrnl</library>
diff --git a/reactos/hal/halx86/xbox/part_xbox.c b/reactos/hal/halx86/xbox/part_xbox.c
index 5146aefb64d..343de551bf8 100644
--- a/reactos/hal/halx86/xbox/part_xbox.c
+++ b/reactos/hal/halx86/xbox/part_xbox.c
@@ -308,6 +308,8 @@ HalpXboxIoWritePartitionTable(IN PDEVICE_OBJECT DeviceObject,
   return STATUS_ACCESS_DENIED;
 }
 
+#define HalExamineMBR HALDISPATCH->HalExamineMBR
+
 void
 HalpXboxInitPartIo(void)
 {