diff --git a/nixos/modules/testing/test-instrumentation.nix b/nixos/modules/testing/test-instrumentation.nix
index 2de978ca1018..4b4284d85319 100644
--- a/nixos/modules/testing/test-instrumentation.nix
+++ b/nixos/modules/testing/test-instrumentation.nix
@@ -98,7 +98,7 @@ let kernel = config.boot.kernelPackages.kernel; in
     networking.usePredictableInterfaceNames = false;
 
     # Make it easy to log in as root when running the test interactively.
-    users.extraUsers.root.initialHashedPassword = mkDefault "";
+    users.extraUsers.root.initialHashedPassword = mkOverride 150 "";
 
   };
 
diff --git a/nixos/modules/virtualisation/docker-image.nix b/nixos/modules/virtualisation/docker-image.nix
index ff276fc86a8e..cabb1712b6c0 100644
--- a/nixos/modules/virtualisation/docker-image.nix
+++ b/nixos/modules/virtualisation/docker-image.nix
@@ -56,7 +56,7 @@ in {
   services.openssh.startWhenNeeded = false;
 
   # Allow the user to login as root without password.
-  users.extraUsers.root.initialHashedPassword = mkDefault "";
+  users.extraUsers.root.initialHashedPassword = mkOverride 150 "";
 
   # Some more help text.
   services.mingetty.helpLine =