diff --git a/.travis.yml b/.travis.yml
index 15d2447..d13c512 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,5 +10,6 @@ before_install:
   - composer update -n
 
 script:
+  - set -e
   - ./vendor/bin/phpcs -v --standard=PSR12 src tests/unit
   - ./vendor/bin/phpunit
diff --git a/tests/unit/ExponentialBackoffTest.php b/tests/unit/ExponentialBackoffTest.php
index 2ad7590..3b52d6a 100644
--- a/tests/unit/ExponentialBackoffTest.php
+++ b/tests/unit/ExponentialBackoffTest.php
@@ -159,7 +159,6 @@ public function dataDelays(): array
      * @covers \CrowdStar\Backoff\ExponentialBackoff::run()
      * @covers \CrowdStar\Backoff\ExponentialBackoff::getTimeoutSeconds()
      * @covers \CrowdStar\Backoff\ExponentialBackoff::getTimeoutMicroseconds()
-     * @group c
      */
     public function testDelays(ExponentialBackoff $backoff, float $expectedMin, float $expectedMax, string $message)
     {