diff --git a/k4MarlinWrapper/src/components/EDM4hep2Lcio.cpp b/k4MarlinWrapper/src/components/EDM4hep2Lcio.cpp
index 6d16d05f..5e242891 100644
--- a/k4MarlinWrapper/src/components/EDM4hep2Lcio.cpp
+++ b/k4MarlinWrapper/src/components/EDM4hep2Lcio.cpp
@@ -19,6 +19,8 @@
 #include "k4MarlinWrapper/converters/EDM4hep2Lcio.h"
 #include "GlobalConvertedObjectsMap.h"
 
+#include "edm4hep/Constants.h"
+
 #include "k4FWCore/DataHandle.h"
 #include "k4FWCore/MetaDataHandle.h"
 
@@ -94,7 +96,7 @@ void EDM4hep2LcioTool::convertTrackerHits(TrackerHitMap& trackerhits_vec, const
   DataHandle<edm4hep::TrackerHitCollection> trackerhits_handle{e4h_coll_name, Gaudi::DataHandle::Reader, this};
   const auto                                trackerhits_coll = trackerhits_handle.get();
 
-  MetaDataHandle<std::string> cellIDStrHandle{trackerhits_handle, "CellIDEncoding", Gaudi::DataHandle::Reader};
+  MetaDataHandle<std::string> cellIDStrHandle{trackerhits_handle, edm4hep::CellIDEncoding, Gaudi::DataHandle::Reader};
 
   auto* conv_trackerhits = convTrackerHits(trackerhits_coll, cellIDStrHandle.get(), trackerhits_vec);
 
@@ -111,7 +113,7 @@ void EDM4hep2LcioTool::convertSimTrackerHits(SimTrackerHitMap& simtrackerhits_ve
   DataHandle<edm4hep::SimTrackerHitCollection> simtrackerhits_handle{e4h_coll_name, Gaudi::DataHandle::Reader, this};
   const auto                                   simtrackerhits_coll = simtrackerhits_handle.get();
 
-  MetaDataHandle<std::string> cellIDHandle{simtrackerhits_handle, "CellIDEncoding", Gaudi::DataHandle::Reader};
+  MetaDataHandle<std::string> cellIDHandle{simtrackerhits_handle, edm4hep::CellIDEncoding, Gaudi::DataHandle::Reader};
   const auto                  cellIDstr = cellIDHandle.get();
 
   auto* conv_simtrackerhits = convSimTrackerHits(simtrackerhits_coll, cellIDstr, simtrackerhits_vec, mcparticles_vec);
@@ -128,7 +130,7 @@ void EDM4hep2LcioTool::convertCalorimeterHits(CaloHitMap& calo_hits_vec, const s
   DataHandle<edm4hep::CalorimeterHitCollection> calohit_handle{e4h_coll_name, Gaudi::DataHandle::Reader, this};
   const auto                                    calohit_coll = calohit_handle.get();
 
-  MetaDataHandle<std::string> cellIDHandle{calohit_handle, "CellIDEncoding", Gaudi::DataHandle::Reader};
+  MetaDataHandle<std::string> cellIDHandle{calohit_handle, edm4hep::CellIDEncoding, Gaudi::DataHandle::Reader};
   const auto                  cellIDstr = cellIDHandle.get();
 
   auto* conv_calohits = convCalorimeterHits(calohit_coll, cellIDstr, calo_hits_vec);
@@ -160,7 +162,7 @@ void EDM4hep2LcioTool::convertSimCalorimeterHits(SimCaloHitMap& sim_calo_hits_ve
   DataHandle<edm4hep::SimCalorimeterHitCollection> sim_calohit_handle{e4h_coll_name, Gaudi::DataHandle::Reader, this};
   const auto                                       simcalohit_coll = sim_calohit_handle.get();
 
-  MetaDataHandle<std::string> cellIDHandle{sim_calohit_handle, "CellIDEncoding", Gaudi::DataHandle::Reader};
+  MetaDataHandle<std::string> cellIDHandle{sim_calohit_handle, edm4hep::CellIDEncoding, Gaudi::DataHandle::Reader};
   const auto                  cellIDstr = cellIDHandle.get();
 
   // TODO mcparticles_vdc
diff --git a/k4MarlinWrapper/src/components/Lcio2EDM4hep.cpp b/k4MarlinWrapper/src/components/Lcio2EDM4hep.cpp
index 6c892b8b..88be478d 100644
--- a/k4MarlinWrapper/src/components/Lcio2EDM4hep.cpp
+++ b/k4MarlinWrapper/src/components/Lcio2EDM4hep.cpp
@@ -23,6 +23,7 @@
 #include <Exceptions.h>
 
 #include <edm4hep/ClusterCollection.h>
+#include <edm4hep/Constants.h>
 #include <edm4hep/EventHeaderCollection.h>
 #include <edm4hep/MCParticleCollection.h>
 #include <edm4hep/ParticleIDCollection.h>
@@ -107,11 +108,11 @@ void Lcio2EDM4hepTool::registerCollection(
     lcioColl->getParameters().getStringKeys(string_keys);
 
     for (auto& elem : string_keys) {
-      if (elem == "CellIDEncoding") {
+      if (elem == edm4hep::CellIDEncoding) {
         const auto& lcio_coll_cellid_str = lcioColl->getParameters().getStringVal(lcio::LCIO::CellIDEncoding);
         auto&       mdFrame              = m_podioDataSvc->getMetaDataFrame();
-        mdFrame.putParameter(podio::collMetadataParamName(name, "CellIDEncoding"), lcio_coll_cellid_str);
-        debug() << "Storing CellIDEncoding " << podio::collMetadataParamName(name, "CellIDEncoding")
+        mdFrame.putParameter(podio::collMetadataParamName(name, edm4hep::CellIDEncoding), lcio_coll_cellid_str);
+        debug() << "Storing CellIDEncoding " << podio::collMetadataParamName(name, edm4hep::CellIDEncoding)
                 << " value: " << lcio_coll_cellid_str << endmsg;
       } else {
         // TODO: figure out where this actually needs to go