diff --git a/k4Reco/DDPlanarDigi/components/DDPlanarDigi.cpp b/k4Reco/DDPlanarDigi/components/DDPlanarDigi.cpp
index 5afab0b..0a5e5b0 100644
--- a/k4Reco/DDPlanarDigi/components/DDPlanarDigi.cpp
+++ b/k4Reco/DDPlanarDigi/components/DDPlanarDigi.cpp
@@ -22,7 +22,7 @@
 #include "edm4hep/SimTrackerHit.h"
 #include "edm4hep/TrackerHitPlaneCollection.h"
 
-#include "Gaudi/Accumulators/RootHistogram.h"
+#include "Gaudi/Accumulators/StaticRootHistogram.h"
 
 #include "DD4hep/DD4hepUnits.h"
 #include "DD4hep/Detector.h"
diff --git a/k4Reco/Overlay/options/runOverlayTiming.py b/k4Reco/Overlay/options/runOverlayTiming.py
index f7a1ef9..27514fb 100644
--- a/k4Reco/Overlay/options/runOverlayTiming.py
+++ b/k4Reco/Overlay/options/runOverlayTiming.py
@@ -43,9 +43,9 @@
 
 overlay = OverlayTiming()
 overlay.MCParticles = ["MCParticle"]
-overlay.BackgroundMCParticleCollectionName = ["MCParticle"]
 overlay.SimTrackerHits = ["VertexBarrelCollection", "VertexEndcapCollection"]
 overlay.SimCalorimeterHits = ["HCalRingCollection"]
+overlay.BackgroundMCParticleCollectionName = "MCParticle"
 overlay.OutputSimTrackerHits = ["NewVertexBarrelCollection", "NewVertexEndcapCollection"]
 overlay.OutputSimCalorimeterHits = ["NewHCalRingCollection"]
 overlay.OutputCaloHitContributions = ["NewCaloHitCollection"]