diff --git a/test/php/library/Icinga/Protocol/Commandpipe/CommandPipeTest.php b/test/php/library/Icinga/Protocol/Commandpipe/CommandPipeTest.php
index 0ec9a4da6..d7ce01fb0 100644
--- a/test/php/library/Icinga/Protocol/Commandpipe/CommandPipeTest.php
+++ b/test/php/library/Icinga/Protocol/Commandpipe/CommandPipeTest.php
@@ -19,7 +19,7 @@ use Icinga\Module\Monitoring\Command\ScheduleCheckCommand;
 use Icinga\Module\Monitoring\Command\SubmitPassiveCheckresultCommand;
 
 if (!defined('EXTCMD_TEST_BIN')) {
-    define('EXTCMD_TEST_BIN', './bin/extcmd_test');
+    define('EXTCMD_TEST_BIN', BaseTestCase::$testDir . '/bin/extcmd_test');
 }
 
 /**