diff --git a/pkgs/desktops/lomiri/development/geonames/default.nix b/pkgs/desktops/lomiri/development/geonames/default.nix
index fee15718c8a8..3b12c7542902 100644
--- a/pkgs/desktops/lomiri/development/geonames/default.nix
+++ b/pkgs/desktops/lomiri/development/geonames/default.nix
@@ -69,7 +69,8 @@ stdenv.mkDerivation (finalAttrs: {
   ];
 
   # Tests need to be able to check locale
-  LC_ALL = lib.optionalString finalAttrs.finalPackage.doCheck "en_US.UTF-8";
+  env.LC_ALL = lib.optionalString finalAttrs.finalPackage.doCheck "en_US.UTF-8";
+
   nativeCheckInputs = [
     glibcLocales
   ];