diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 20d5bcc23..41c8ff2b9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -112,6 +112,7 @@ jobs:
         nix_conf: |
           extra-sandbox-paths = /etc/docker/config.json=/home/runner/.docker/config.json
     - uses: DeterminateSystems/magic-nix-cache-action@v2
+    - run: nix build .#testnet
     - run: >
           nix run github:nix-community/nix-eval-jobs
           -- --gc-roots-dir gcroot
diff --git a/flake.nix b/flake.nix
index 77435983b..ee633e165 100644
--- a/flake.nix
+++ b/flake.nix
@@ -108,7 +108,7 @@
           tag = "nix";
           fromImage = base-image-testnet;
           inherit copyToRoot;
-          config.Entrypoint = ["${start external-node-testnet}/bin/start.sh"];
+          # config.Entrypoint = ["${start external-node-testnet}/bin/start.sh"];
         };
       });
 }