diff --git a/buildkite.yaml b/buildkite.yaml
index 2850712..0097f4d 100644
--- a/buildkite.yaml
+++ b/buildkite.yaml
@@ -14,15 +14,15 @@ steps:
   - cachix push alejandra develop
 
 - label: coverage
-  artifact_paths:
-  - tarpaulin-report.html
+  if: build.branch == "main"
   command:
   - echo +++
   - direnv allow
   - eval "$(direnv export bash)"
-  - cargo tarpaulin -o html
+  - cargo tarpaulin --coveralls "${COVERALLS_REPO_TOKEN}"
 
 - label: diff
+  if: build.branch != "main"
   command:
   - git clone --depth 1 https://github.com/nixos/nixpkgs
   - echo --- Closure @ before