diff --git a/nixos/maintainers/scripts/incus/incus-container-image.nix b/nixos/maintainers/scripts/incus/incus-container-image.nix
index 989f583307fe..8007e5cad018 100644
--- a/nixos/maintainers/scripts/incus/incus-container-image.nix
+++ b/nixos/maintainers/scripts/incus/incus-container-image.nix
@@ -32,6 +32,9 @@
       };
     };
 
+  # Disable the cloneConfig module. We have our own Service to generate a configuration.nix.
+  installer.cloneConfig = false;
+
   networking = {
     dhcpcd.enable = false;
     useDHCP = false;
diff --git a/nixos/maintainers/scripts/incus/incus-virtual-machine-image.nix b/nixos/maintainers/scripts/incus/incus-virtual-machine-image.nix
index f06b43dc2675..e7d93a69094e 100644
--- a/nixos/maintainers/scripts/incus/incus-virtual-machine-image.nix
+++ b/nixos/maintainers/scripts/incus/incus-virtual-machine-image.nix
@@ -32,6 +32,9 @@
       };
     };
 
+  # Disable the cloneConfig module. We have our own Service to generate a configuration.nix.
+  installer.cloneConfig = false;
+
   # Network
   networking = {
     dhcpcd.enable = false;
diff --git a/nixos/tests/incus/incus-tests-module.nix b/nixos/tests/incus/incus-tests-module.nix
index 69b0d3c13825..005317e02e72 100644
--- a/nixos/tests/incus/incus-tests-module.nix
+++ b/nixos/tests/incus/incus-tests-module.nix
@@ -164,6 +164,7 @@ in
 
                   with subtest("[${image_id}] default configuration.nix is created on first boot"):
                       server.succeed(f"incus exec {instance_name} -- test -f /etc/nixos/configuration.nix")
+                      server.succeed(f"incus exec {instance_name} -- grep -q 'default incus configuration' /etc/nixos/configuration.nix")
 
                   with subtest("[${image_id}] configuration.nix create service does not overwrite existing config"):
                       server.succeed(f"incus exec {instance_name} -- systemctl restart incus-create-nixos-config.service")