diff --git a/lib/base/function.ti b/lib/base/function.ti
index 756a909a9..f51b189b4 100644
--- a/lib/base/function.ti
+++ b/lib/base/function.ti
@@ -26,9 +26,9 @@ namespace icinga
 
 abstract class Function
 {
-	String "name";
-	bool side_effect_free;
-	bool deprecated;
+	[config] String "name";
+	[config] bool side_effect_free;
+	[config] bool deprecated;
 };
 
 }