diff --git a/lib/default.nix b/lib/default.nix
index 956055b70a8f..d2239d26eadf 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -63,7 +63,7 @@ let
       deepSeq elem elemAt filter genericClosure genList getAttr
       hasAttr head isAttrs isBool isInt isList isString length
       lessThan listToAttrs pathExists readFile replaceStrings seq
-      stringLength sub substring tail;
+      stringLength sub substring tail trace;
     inherit (self.trivial) id const pipe concat or and bitAnd bitOr bitXor
       bitNot boolToString mergeAttrs flip mapNullable inNixShell isFloat min max
       importJSON importTOML warn info showWarnings nixpkgsVersion version mod compare