diff --git a/formatter.nix b/formatter.nix
index 238b98b13..760533ad9 100644
--- a/formatter.nix
+++ b/formatter.nix
@@ -27,8 +27,7 @@
           extraPythonPackages =
             # clan-app currently only exists on linux
 
-            self'.packages.clan-vm-manager.testDependencies
-            ++ self'.packages.clan-cli.testDependencies;
+            self'.packages.clan-vm-manager.testDependencies ++ self'.packages.clan-cli.testDependencies;
           modules = [ "clan_vm_manager" ];
         };
       };