diff --git a/Pilot/pilotTools.py b/Pilot/pilotTools.py
index 8afe0f62..7ac99e65 100644
--- a/Pilot/pilotTools.py
+++ b/Pilot/pilotTools.py
@@ -832,7 +832,7 @@ def exitWithError(self, errorCode):
 
         self.log.info("List of child processes of current PID:")
         retCode, _outData = self.executeAndGetOutput(
-            "ps --forest -o pid,%%cpu,%%mem,tty,stat,time,cmd -g %d" % os.getpid()
+            "ps --forest -o pid,%%cpu,%%mem,tty,stat,time,cmd --ppid %d" % os.getpid()
         )
         if retCode:
             self.log.error("Failed to issue ps [ERROR %d] " % retCode)