diff --git a/reactos/include/psdk/msxml2.idl b/reactos/include/psdk/msxml2.idl
index d91ba4761a7..ee145aaabc2 100644
--- a/reactos/include/psdk/msxml2.idl
+++ b/reactos/include/psdk/msxml2.idl
@@ -107,9 +107,9 @@ interface ISchemaNotation;
 cpp_quote("#define DOMDocument DOMDocument2")
 cpp_quote("#define CLSID_DOMDocument CLSID_DOMDocument2")
 
-cpp_quote("#ifndef __WIDL_XMLDOM_H")
-typedef enum tagDOMNodeType 
-{  
+cpp_quote("#if !defined(__WIDL_XMLDOM_H) && !defined(__xmldom_h__)")
+typedef enum tagDOMNodeType
+{
     NODE_INVALID  		= 0,
     NODE_ELEMENT  		= 1,
     NODE_ATTRIBUTE		= 2,
diff --git a/reactos/include/psdk/msxml6.idl b/reactos/include/psdk/msxml6.idl
index 45cef98825f..e045cd8cccc 100644
--- a/reactos/include/psdk/msxml6.idl
+++ b/reactos/include/psdk/msxml6.idl
@@ -113,7 +113,7 @@ interface ISchemaNotation;
 cpp_quote("#define DOMDocument DOMDocument2")
 cpp_quote("#define CLSID_DOMDocument CLSID_DOMDocument2")
 
-cpp_quote("#ifndef __WIDL_XMLDOM_H")
+cpp_quote("#if !defined(__WIDL_XMLDOM_H) && !defined(__xmldom_h__)")
 typedef enum tagDOMNodeType
 {
     NODE_INVALID  		= 0,