diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6332e4935..826909b36 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -42,7 +42,8 @@ jobs:
         run: |
           # Tolerate pre-existing flaky tests (Bun mock pollution / order-dependent state).
           # We still require lcov.info to be generated and contain real coverage data.
-          bun test --coverage --coverage-reporter lcov --coverage-dir coverage 2>&1 | grep -vE '^\s*(\(pass\)|\(skip\))' | sed '/^.*\/__tests__\/.*:$/d' | cat -s || true
+          set -o pipefail
+          bun test --coverage --coverage-reporter lcov --coverage-dir coverage 2>&1 | grep -vE '^\s*(\(pass\)|\(skip\))' | sed '/^.*\/__tests__\/.*:$/d' | cat -s
           test -s coverage/lcov.info
           grep -q '^SF:' coverage/lcov.info