diff --git a/pkgs/by-name/te/telepathy-glib/package.nix b/pkgs/by-name/te/telepathy-glib/package.nix
index def1350fefff..ad602c4e47da 100644
--- a/pkgs/by-name/te/telepathy-glib/package.nix
+++ b/pkgs/by-name/te/telepathy-glib/package.nix
@@ -49,7 +49,7 @@ stdenv.mkDerivation (finalAttrs: {
     "--enable-vala-bindings"
   ];
 
-  LC_ALL = "en_US.UTF-8";
+  env.LC_ALL = "en_US.UTF-8";
 
   enableParallelBuilding = true;