diff --git a/immich-container.nix b/immich-container.nix
index 3a5c187..778632f 100644
--- a/immich-container.nix
+++ b/immich-container.nix
@@ -6,7 +6,7 @@ let
   hostname = config.instance.hostname;
 
   mkEnvFile = attrs:
-    writeText "env-file"
+    pkgs.writeText "env-file"
     (concatStringsSep "\n" (mapAttrsToList (k: v: "${k}=${v}") attrs));
 
   databasePassword = pkgs.lib.passwd.stablerandom-passwd-file "immich-db-passwd"