diff --git a/reactos/drivers/fs/np/npfs.xml b/reactos/drivers/fs/np/npfs.xml
index e2a898a6357..4606e74ee1e 100644
--- a/reactos/drivers/fs/np/npfs.xml
+++ b/reactos/drivers/fs/np/npfs.xml
@@ -1,6 +1,7 @@
 <module name="npfs" type="kernelmodedriver" installbase="system32/drivers" installname="npfs.sys">
 	<include base="npfs">.</include>
 	<define name="__USE_W32API" />
+	<define name="__NO_CTYPE_INLINES" />
 	<library>ntoskrnl</library>
 	<library>hal</library>
 	<file>create.c</file>