diff --git a/pkgs/development/libraries/glibc-2.12/locales.nix b/pkgs/development/libraries/glibc-2.12/locales.nix
index d598e0e094d..31a03c48d85 100644
--- a/pkgs/development/libraries/glibc-2.12/locales.nix
+++ b/pkgs/development/libraries/glibc-2.12/locales.nix
@@ -40,7 +40,7 @@ in
     installPhase =
       ''
         ensureDir "$out/lib/locale"
-        cp -v "$TMPDIR/nix/store/"*"/lib/locale/locale-archive" "$out/lib/locale"
+        cp -v "$TMPDIR/$NIX_STORE/"*"/lib/locale/locale-archive" "$out/lib/locale"
       '';
 
     meta.description = "Locale information for the GNU C Library";