diff --git a/src/Worker.php b/src/Worker.php
index 3c396298..1b08e2db 100644
--- a/src/Worker.php
+++ b/src/Worker.php
@@ -709,7 +709,7 @@ protected static function init(): void
 
         // Start file.
         $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
-        static::$startFile ??= end($backtrace)['file'];
+        static::$startFile = static::$startFile ?: end($backtrace)['file'];
         $startFilePrefix = basename(static::$startFile);
         $startFileDir = dirname(static::$startFile);