diff --git a/pkgs/development/libraries/glibc/locales.nix b/pkgs/development/libraries/glibc/locales.nix
index 6a33464c672a..eddeb5e3ec4b 100644
--- a/pkgs/development/libraries/glibc/locales.nix
+++ b/pkgs/development/libraries/glibc/locales.nix
@@ -59,7 +59,11 @@
       echo SUPPORTED-LOCALES='${toString locales}' > ../glibc-2*/localedata/SUPPORTED
     '';
 
-  enableParallelBuilding = true;
+  # Current `nixpkgs` way of building locales is not compatible with
+  # parallel install. `locale-archive` is updated in parallel with
+  # multiple `localedef` processes and causes non-deterministic result:
+  #   https://github.com/NixOS/nixpkgs/issues/245360
+  enableParallelBuilding = false;
 
   makeFlags = (previousAttrs.makeFlags or []) ++ [
     "localedata/install-locales"