diff --git a/lib/default.nix b/lib/default.nix
index ae8a1899b193..3e30ec515fcb 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -60,7 +60,7 @@ let
       nixpkgsVersion mod;
 
     inherit (fixedPoints) fix fix' extends composeExtensions
-      makeExtensible makeExtensibleWithCustomName makeExtensibleWithInterface;
+      makeExtensible makeExtensibleWithCustomName;
     inherit (attrsets) attrByPath hasAttrByPath setAttrByPath
       getAttrFromPath attrVals attrValues catAttrs filterAttrs
       filterAttrsRecursive foldAttrs collect nameValuePair mapAttrs