diff --git a/reactos/subsys/smss/smss.xml b/reactos/subsys/smss/smss.xml
index c6018df689f..02d919c7fd0 100644
--- a/reactos/subsys/smss/smss.xml
+++ b/reactos/subsys/smss/smss.xml
@@ -1,5 +1,6 @@
 <module name="smss" type="nativecui" installbase="system32" installname="smss.exe">
 	<include base="smss">.</include>
+	<define name="__USE_W32API" />
 	<define name="_DISABLE_TIDENTS" />
 	<library>smlib</library>
 	<library>ntdll</library>