diff --git a/lib/customisation.nix b/lib/customisation.nix
index fe78225703a80..be6585d5fa6e4 100644
--- a/lib/customisation.nix
+++ b/lib/customisation.nix
@@ -30,8 +30,6 @@ let
     seq
     flatten
     deepSeq
-    warnIf
-    isInOldestRelease
     extends
     ;
   inherit (lib.strings) levenshtein levenshteinAtMost;