diff --git a/flake.nix b/flake.nix
index 51174e1da74..a105607417f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -34,6 +34,8 @@
                 pytest
               ];
 
+            LOCALE_ARCHIVE = "${pkgs.glibcLocales}/lib/locale/locale-archive";
+
             shellHook = ''
               function dev-help {
                 echo -e "\nWelcome to a GRASS development environment !"