diff --git a/RecCalorimeter/src/components/CaloTopoCluster.h b/RecCalorimeter/src/components/CaloTopoCluster.h
index 42b3a78..7b16b60 100644
--- a/RecCalorimeter/src/components/CaloTopoCluster.h
+++ b/RecCalorimeter/src/components/CaloTopoCluster.h
@@ -5,6 +5,8 @@
 #include "Gaudi/Algorithm.h"
 #include "GaudiKernel/ToolHandle.h"
 
+#include "edm4hep/Constants.h"
+
 // Key4HEP
 #include "k4FWCore/DataHandle.h"
 #include "k4FWCore/MetaDataHandle.h"
diff --git a/RecCalorimeter/src/components/CreatePositionedCaloCells.h b/RecCalorimeter/src/components/CreatePositionedCaloCells.h
index d3b51a1..88da76c 100644
--- a/RecCalorimeter/src/components/CreatePositionedCaloCells.h
+++ b/RecCalorimeter/src/components/CreatePositionedCaloCells.h
@@ -1,6 +1,9 @@
 #ifndef RECCALORIMETER_CREATEPOSITIONEDCALOCELLS_H
 #define RECCALORIMETER_CREATEPOSITIONEDCALOCELLS_H
 
+
+#include "edm4hep/Constants.h"
+
 // k4FWCore
 #include "k4FWCore/DataHandle.h"
 #include "k4FWCore/MetaDataHandle.h"
diff --git a/RecFCCeeCalorimeter/src/components/AugmentClustersFCCee.h b/RecFCCeeCalorimeter/src/components/AugmentClustersFCCee.h
index 98ee34b..901fdb7 100644
--- a/RecFCCeeCalorimeter/src/components/AugmentClustersFCCee.h
+++ b/RecFCCeeCalorimeter/src/components/AugmentClustersFCCee.h
@@ -1,6 +1,8 @@
 #ifndef RECFCCEECALORIMETER_AUGMENTCLUSTERSFCCEE_H
 #define RECFCCEECALORIMETER_AUGMENTCLUSTERSFCCEE_H
 
+#include "edm4hep/Constants.h"
+
 // Key4HEP
 #include "k4FWCore/DataHandle.h"
 #include "k4FWCore/MetaDataHandle.h"
diff --git a/RecFCCeeCalorimeter/src/components/CalibrateCaloClusters.h b/RecFCCeeCalorimeter/src/components/CalibrateCaloClusters.h
index 0281a31..1205eef 100644
--- a/RecFCCeeCalorimeter/src/components/CalibrateCaloClusters.h
+++ b/RecFCCeeCalorimeter/src/components/CalibrateCaloClusters.h
@@ -1,6 +1,8 @@
 #ifndef RECFCCEECALORIMETER_CALIBRATECALOCLUSTERS_H
 #define RECFCCEECALORIMETER_CALIBRATECALOCLUSTERS_H
 
+#include "edm4hep/Constants.h"
+
 // Key4HEP
 #include "k4FWCore/DataHandle.h"
 #include "k4FWCore/MetaDataHandle.h"
diff --git a/RecFCCeeCalorimeter/src/components/CaloTopoClusterFCCee.h b/RecFCCeeCalorimeter/src/components/CaloTopoClusterFCCee.h
index 34bc550..918c92e 100644
--- a/RecFCCeeCalorimeter/src/components/CaloTopoClusterFCCee.h
+++ b/RecFCCeeCalorimeter/src/components/CaloTopoClusterFCCee.h
@@ -10,6 +10,8 @@
 #include "Gaudi/Algorithm.h"
 #include "GaudiKernel/ToolHandle.h"
 
+#include "edm4hep/Constants.h"
+
 // Key4HEP
 #include "k4FWCore/DataHandle.h"
 #include "k4FWCore/MetaDataHandle.h"
diff --git a/RecFCCeeCalorimeter/src/components/PhotonIDTool.h b/RecFCCeeCalorimeter/src/components/PhotonIDTool.h
index bf3c6d6..32c23b2 100644
--- a/RecFCCeeCalorimeter/src/components/PhotonIDTool.h
+++ b/RecFCCeeCalorimeter/src/components/PhotonIDTool.h
@@ -1,6 +1,9 @@
 #ifndef RECFCCEECALORIMETER_PHOTONIDTOOL_H
 #define RECFCCEECALORIMETER_PHOTONIDTOOL_H
 
+
+#include "edm4hep/Constants.h"
+
 // Key4HEP
 #include "k4FWCore/DataHandle.h"
 #include "k4FWCore/MetaDataHandle.h"