diff --git a/nixproc/backends/systemd/test-module/default.nix b/nixproc/backends/systemd/test-module/default.nix
index 66a340e..eddc0b3 100644
--- a/nixproc/backends/systemd/test-module/default.nix
+++ b/nixproc/backends/systemd/test-module/default.nix
@@ -16,7 +16,8 @@ in
 {
   inherit (profileSettings) params;
 
-  nixosModules = pkgs.lib.optional profileSettings.params.forceDisableUserChange ./xserver-autologin-module.nix;
+  nixosModules = pkgs.lib.optional profileSettings.params.forceDisableUserChange ./xserver-autologin-module.nix
+    ++ pkgs.lib.optional (!profileSettings.params.forceDisableUserChange) ./systemd-path.nix;
 
   systemPackages = [
     tools.systemd
diff --git a/nixproc/backends/systemd/test-module/systemd-path.nix b/nixproc/backends/systemd/test-module/systemd-path.nix
new file mode 100644
index 0000000..3b885fc
--- /dev/null
+++ b/nixproc/backends/systemd/test-module/systemd-path.nix
@@ -0,0 +1,5 @@
+{...}:
+
+{
+  boot.extraSystemdUnitPaths = [ "/etc/systemd-mutable/system" ];
+}
diff --git a/tests/webapps-agnostic-systemd.nix b/tests/webapps-agnostic-systemd.nix
index 2e1dbb7..b63957a 100644
--- a/tests/webapps-agnostic-systemd.nix
+++ b/tests/webapps-agnostic-systemd.nix
@@ -44,6 +44,8 @@ makeTest {
       virtualisation.writableStore = true;
       virtualisation.memorySize = 1024;
 
+      boot.extraSystemdUnitPaths = [ "/etc/systemd-mutable/system" ];
+
       # We can't download any substitutes in a test environment. To make tests
       # faster, we disable substitutes so that Nix does not waste any time by
       # attempting to download them.