diff --git a/lib/types.nix b/lib/types.nix
index 9bce56bf807..baf8aa5e574 100644
--- a/lib/types.nix
+++ b/lib/types.nix
@@ -10,7 +10,6 @@ with import ./strings.nix;
 rec {
 
   isType = type: x: (x._type or "") == type;
-  typeOf = x: x._type or "";
 
   setType = typeName: value: value // {
     _type = typeName;