diff --git a/lib/lists.nix b/lib/lists.nix
index be541427c247..9f2ccc00cafe 100644
--- a/lib/lists.nix
+++ b/lib/lists.nix
@@ -7,7 +7,7 @@ let
 in
 rec {
 
-  inherit (builtins) head tail length isList elemAt concatLists filter elem genList;
+  inherit (builtins) head tail length isList elemAt concatLists filter elem genList map;
 
   /*  Create a list consisting of a single element.  `singleton x` is
       sometimes more convenient with respect to indentation than `[x]`