diff --git a/src/plugins/monitoring/pedestal_online/JEventProcessor_pedestal_online.cc b/src/plugins/monitoring/pedestal_online/JEventProcessor_pedestal_online.cc
index ea68e76f1..53883a297 100644
--- a/src/plugins/monitoring/pedestal_online/JEventProcessor_pedestal_online.cc
+++ b/src/plugins/monitoring/pedestal_online/JEventProcessor_pedestal_online.cc
@@ -144,7 +144,7 @@ void JEventProcessor_pedestal_online::Process(const std::shared_ptr<const JEvent
 	event->Get(f125PIs);
 	
 	// Although we are only filling objects local to this plugin, the directory changes: Global ROOT lock
-	lockService->RootFillLock(this);
+	lockService->RootWriteLock();
 
 	if (peddir!=NULL) peddir->cd();
 	
@@ -335,8 +335,9 @@ void JEventProcessor_pedestal_online::Process(const std::shared_ptr<const JEvent
 	}
 
 	maindir->cd();
+	
 	// Unlock ROOT
-	lockService->RootFillUnLock(this);
+	lockService->RootUnLock();
 }