diff --git a/deployment/check/common/deployerNode.nix b/deployment/check/common/deployerNode.nix
index 4a01f2cd..94cf491c 100644
--- a/deployment/check/common/deployerNode.nix
+++ b/deployment/check/common/deployerNode.nix
@@ -74,20 +74,18 @@ in
           ## configuration and the store paths needed to build it and
           ## dump them in `system.extraDependencies`.
           machine =
-            (pkgs.nixos (
-              [
-                ./targetNode.nix
-                # ../../../infra/common/nixos/repart.nix
-                config.system.extraDependenciesFromModule
-                {
-                  nixpkgs.hostPlatform = "x86_64-linux";
-                  _module.args = { inherit inputs sources; };
-                  enableAcme = config.enableAcme;
-                  acmeNodeIP = config.acmeNodeIP;
-                }
-              ]
-              ++ (lib.optional config.useFlake "${modulesPath}/../lib/testing/nixos-test-base.nix")
-            )).config;
+            (pkgs.nixos [
+              ./targetNode.nix
+              # ../../../infra/common/nixos/repart.nix
+              "${modulesPath}/../lib/testing/nixos-test-base.nix"
+              config.system.extraDependenciesFromModule
+              {
+                nixpkgs.hostPlatform = "x86_64-linux";
+                _module.args = { inherit inputs sources; };
+                enableAcme = config.enableAcme;
+                acmeNodeIP = config.acmeNodeIP;
+              }
+            ]).config;
 
         in
         [
diff --git a/deployment/check/common/nixosTest.nix b/deployment/check/common/nixosTest.nix
index 5dcc81c9..98b110a2 100644
--- a/deployment/check/common/nixosTest.nix
+++ b/deployment/check/common/nixosTest.nix
@@ -4,6 +4,7 @@
   config,
   hostPkgs,
   sources,
+  modulesPath,
   ...
 }:
 
@@ -112,7 +113,7 @@ in
       (genAttrs config.targetMachines (_: {
         imports = [
           ./targetNode.nix
-        ] ++ (lib.optional config.useFlake "${sources.nixpkgs}/nixos/lib/testing/nixos-test-base.nix");
+        ] ++ (lib.optional config.useFlake "${modulesPath}/../lib/testing/nixos-test-base.nix");
         _module.args = { inherit inputs sources; };
         enableAcme = config.enableAcme;
         acmeNodeIP = if config.enableAcme then config.nodes.acme.networking.primaryIPAddress else null;