diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 48632fe..8fa1325 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,9 +30,6 @@ jobs:
       -
         name: "Test: integration test"
         run: nix flake check
-      -
-        name: "Test: vendored script equals build"
-        run: diff -u ./tomono result/bin/tomono
       -
         name: Create artifact bundle
         run: |
diff --git a/flake.nix b/flake.nix
index 3197ae5..1173822 100644
--- a/flake.nix
+++ b/flake.nix
@@ -84,6 +84,8 @@
                 dontUnpack = true;
                 buildPhase = ''
                   ${tomono-test}/bin/tomono-test
+                  # Check the vendored script is up to date
+                  ${pkgs.diffutils}/bin/diff -u ${./tomono} ${self.packages.${system}.dist}/bin/tomono
                 '';
                 # To keep Nix happy
                 installPhase = "echo done > $out";