diff --git a/nix/nixos-module.nix b/nix/nixos-module.nix
index 342ed89..3e7c507 100644
--- a/nix/nixos-module.nix
+++ b/nix/nixos-module.nix
@@ -46,11 +46,7 @@ let
     SESSION_SECURE_COOKIE = lib.boolToString cfg.backend.cookieSecure;
   };
 
-  fpmBaseEnvironment = lib.filterAttrs (
-    environmentName: environmentValue: environmentValue != ""
-  ) appEnvironment;
-
-  fpmEnvironment = fpmBaseEnvironment // {
+  fpmEnvironment = appEnvironment // {
     APP_KEY = "$APP_KEY";
   };