diff --git a/build-aux/list2typedef b/build-aux/list2typedef
index 1d677552..d0e801d9 100755
--- a/build-aux/list2typedef
+++ b/build-aux/list2typedef
@@ -155,6 +155,7 @@ main()
          title="$typedef Type">
   <typedef name="$typedef" desc="$typedef">
     <enum type="integer">
+      <item name="${typedef^^}_NONE" value="0" desc="NONE" />
 EOF
 
   while read line; do
diff --git a/build-aux/test/test-list2typedef b/build-aux/test/test-list2typedef
index 7b665f46..01923a43 100755
--- a/build-aux/test/test-list2typedef
+++ b/build-aux/test/test-list2typedef
@@ -43,6 +43,7 @@ Second'\''s @     @Line
          title="FooType Type">
   <typedef name="FooType" desc="FooType">
     <enum type="integer">
+      <item name="FOOTYPE_NONE" value="0" desc="NONE" />
       <item name="FOOTYPE_FIRST" value="2706493105" desc="First" />
       <item name="FOOTYPE_SECONDS_LINE" value="3512333918" desc="Second'\''s @     @Line" />
       <item name="FOOTYPE_THIRD" value="519392729" desc="!!!THIRD!!!" />