diff --git a/pkgs/development/python-modules/musicbrainzngs/default.nix b/pkgs/development/python-modules/musicbrainzngs/default.nix
index 7992af9e1fbe..6b85437a7a1f 100644
--- a/pkgs/development/python-modules/musicbrainzngs/default.nix
+++ b/pkgs/development/python-modules/musicbrainzngs/default.nix
@@ -17,7 +17,7 @@ buildPythonPackage rec {
 
   buildInputs = [ pkgs.glibcLocales ];
 
-  LC_ALL = "en_US.UTF-8";
+  env.LC_ALL = "en_US.UTF-8";
 
   preCheck = ''
     # Remove tests that rely on networking (breaks sandboxed builds)