diff --git a/reactos/drivers/input/i8042prt/i8042prt.xml b/reactos/drivers/input/i8042prt/i8042prt.xml
index 0a191737516..ca4085c16de 100644
--- a/reactos/drivers/input/i8042prt/i8042prt.xml
+++ b/reactos/drivers/input/i8042prt/i8042prt.xml
@@ -2,6 +2,7 @@
 	<bootstrap base="reactos" />
 	<include base="i8042prt">.</include>
 	<define name="__USE_W32API" />
+	<define name="__REACTOS__" />
 	<library>ntoskrnl</library>
 	<library>hal</library>
 	<file>i8042prt.c</file>