diff --git a/dlls/msxml3/dispex.c b/dlls/msxml3/dispex.c
index 436c27777f4..67ce77c48c2 100644
--- a/dlls/msxml3/dispex.c
+++ b/dlls/msxml3/dispex.c
@@ -78,6 +78,7 @@ static ITypeLib *typelib;
 static ITypeInfo *typeinfos[LAST_tid];
 
 static REFIID tid_ids[] = {
+    &IID_NULL,
     &IID_IXMLDOMAttribute,
     &IID_IXMLDOMCDATASection,
     &IID_IXMLDOMComment,
diff --git a/dlls/msxml3/msxml_private.h b/dlls/msxml3/msxml_private.h
index 8b84acaa36b..698655e4100 100644
--- a/dlls/msxml3/msxml_private.h
+++ b/dlls/msxml3/msxml_private.h
@@ -38,6 +38,7 @@ typedef enum {
 
 /* typelibs */
 typedef enum tid_t {
+    NULL_tid,
     IXMLDOMAttribute_tid,
     IXMLDOMCDATASection_tid,
     IXMLDOMComment_tid,