diff --git a/tests/src/Unit/Access/CustomParameterNamesAccessCheckTest.php b/tests/src/Unit/Access/CustomParameterNamesAccessCheckTest.php
index 977e75f..f4eebdc 100644
--- a/tests/src/Unit/Access/CustomParameterNamesAccessCheckTest.php
+++ b/tests/src/Unit/Access/CustomParameterNamesAccessCheckTest.php
@@ -87,14 +87,10 @@ class CustomParameterNamesAccessCheckTest extends \PHPUnit_Framework_TestCase {
     }
 
     // The ASCII control characters are in the range 0x00 to 0x1F plus 0x7F.
-    $ascii_control_chars = [];
     for ($ascii = 0; $ascii <= 0x1F; $ascii++) {
-      $ascii_control_chars[] = chr($ascii);
-    }
-    $ascii_control_chars[] = chr(0x7F);
-    foreach ($ascii_control_chars as $ascii_control_char) {
-      $data['unsafe-ascii-control-' . $ascii] = ['kitt' . $ascii_control_char . 'ens', FALSE];
+      $data['unsafe-ascii-control-' . $ascii] = ['kitt' . chr($ascii) . 'ens', FALSE];
     }
+    $data['unsafe-ascii-control-' . 0x7F] = ['kitt' . chr(0x7F) . 'ens', FALSE];
 
     return $data;
   }