diff --git a/idl/idl_api.ysl2 b/idl/idl_api.ysl2
index a808735..532ce83 100644
--- a/idl/idl_api.ysl2
+++ b/idl/idl_api.ysl2
@@ -30,6 +30,16 @@ def "func:idl_typekind_is_generic" {
     result "func:exists(/pEpACIDLang/idl/typekinds/generics/*[name()=$typekind])"
 }
 
+def "func:idl_type_is_defined" {
+    param "idltype";
+    choose {
+    when "func:idl_type_get_typekind_of_type($idltype)"
+        result "true()";
+    otherwise
+        result "false()";
+    }
+}
+
 def "func:idl_type_is_of_typekind_basetype" {
     param "idltype";
     result "func:exists(/pEpACIDLang/idl/basetypes/*[name()=$idltype])";
@@ -55,16 +65,6 @@ def "func:idl_type_is_of_typekind_list" {
     result "false()";
 }
 
-def "func:idl_type_is_defined" {
-    param "idltype";
-    choose {
-        when "func:idl_type_get_typekind_of_type($idltype)"
-            result "true()";
-        otherwise
-            result "false()";
-    }
-}
-
 def "func:idl_type_get_typekind_of_type" {
     param "idltype";
     choose {