diff --git a/checks/morph/flake-module.nix b/checks/morph/flake-module.nix
index 8d591a9f0..84884e467 100644
--- a/checks/morph/flake-module.nix
+++ b/checks/morph/flake-module.nix
@@ -44,7 +44,11 @@
               {
                 environment.etc."install-closure".source = "${closureInfo}/store-paths";
                 system.extraDependencies = dependencies;
+
                 virtualisation.memorySize = 2048;
+                virtualisation.useNixStoreImage = true;
+                virtualisation.writableStore = true;
+
                 environment.systemPackages = [ self.packages.${pkgs.system}.clan-cli-full ];
               };
           };
diff --git a/checks/morph/template/configuration.nix b/checks/morph/template/configuration.nix
index 133705497..66ffa4856 100644
--- a/checks/morph/template/configuration.nix
+++ b/checks/morph/template/configuration.nix
@@ -8,5 +8,8 @@
     (modulesPath + "/profiles/minimal.nix")
   ];
 
+  virtualisation.useNixStoreImage = true;
+  virtualisation.writableStore = true;
+
   clan.core.enableRecommendedDefaults = false;
 }