diff --git a/Tests/runner.php b/Tests/runner.php
index c6bafc7..b6a1196 100644
--- a/Tests/runner.php
+++ b/Tests/runner.php
@@ -30,7 +30,7 @@
  */
 
 if (php_sapi_name() !== 'cli') {
-    echo('The tests can only be executed in CLI!' . PHP_EOL);
+    echo 'The tests can only be executed in CLI!' . PHP_EOL;
     die(1);
 }