diff --git a/pkgs/applications/science/math/wolfram-engine/l10ns.nix b/pkgs/applications/science/math/wolfram-engine/l10ns.nix
index ae1886bae154..af80c3e37b32 100644
--- a/pkgs/applications/science/math/wolfram-engine/l10ns.nix
+++ b/pkgs/applications/science/math/wolfram-engine/l10ns.nix
@@ -45,7 +45,7 @@ let allVersions = with lib; flip map
   ]
   ({ version, lang, language, sha256, installer }: {
     inherit version lang;
-    name = "wolfram-engine-${version}" + optionalString (lang != "en") "-${lang}";
+    name = "wolfram-engine-${version}" + lib.optionalString (lang != "en") "-${lang}";
     src = requireFile {
       name = installer;
       message = ''
@@ -58,9 +58,8 @@ let allVersions = with lib; flip map
     };
   });
 minVersion =
-  with lib;
   if majorVersion == null
-  then elemAt (builtins.splitVersion (elemAt allVersions 0).version) 0
+  then lib.elemAt (builtins.splitVersion (lib.elemAt allVersions 0).version) 0
   else majorVersion;
 maxVersion = toString (1 + builtins.fromJSON minVersion);
 in