diff --git a/nixos/tests/docker-tools-overlay.nix b/nixos/tests/docker-tools-overlay.nix
index 6781388e639b..14e33899affc 100644
--- a/nixos/tests/docker-tools-overlay.nix
+++ b/nixos/tests/docker-tools-overlay.nix
@@ -12,7 +12,7 @@ import ./make-test-python.nix ({ pkgs, ... }:
       { ... }:
       {
         virtualisation.docker.enable = true;
-        virtualisation.docker.storageDriver = "overlay";  # defaults to overlay2
+        virtualisation.docker.storageDriver = "overlay2";
       };
   };