diff --git a/Configuration/Applications/python/ConfigBuilder.py b/Configuration/Applications/python/ConfigBuilder.py
index a48bc444b6977..3e22c74bfbccd 100644
--- a/Configuration/Applications/python/ConfigBuilder.py
+++ b/Configuration/Applications/python/ConfigBuilder.py
@@ -1723,7 +1723,7 @@ def prepare_NANO(self, stepSpec = '' ):
         ''' Enrich the schedule with NANO '''
         _,_nanoSeq,_nanoCff = self.loadDefaultOrSpecifiedCFF(stepSpec,self.NANODefaultCFF,self.NANODefaultSeq)
         self.scheduleSequence(_nanoSeq,'nanoAOD_step')
-        custom = "nanoAOD_customizeData" if self._options.isData else "nanoAOD_customizeMC"
+        custom = "nanoAOD_customizeCommon"
         self._options.customisation_file.insert(0,'.'.join([_nanoCff,custom]))
         if self._options.hltProcess:
             if len(self._options.customise_commands) > 1:
diff --git a/PhysicsTools/NanoAOD/python/nano_cff.py b/PhysicsTools/NanoAOD/python/nano_cff.py
index 4e9965a19b938..d10ba5084fe2d 100644
--- a/PhysicsTools/NanoAOD/python/nano_cff.py
+++ b/PhysicsTools/NanoAOD/python/nano_cff.py
@@ -191,14 +191,6 @@ def nanoAOD_customizeCommon(process):
 
     return process
 
-def nanoAOD_customizeData(process):
-    process = nanoAOD_customizeCommon(process)
-    return process
-
-def nanoAOD_customizeMC(process):
-    process = nanoAOD_customizeCommon(process)
-    return process
-
 ###increasing the precision of selected GenParticles.
 def nanoWmassGenCustomize(process):
     pdgSelection="?(abs(pdgId) == 11|| abs(pdgId)==13 || abs(pdgId)==15 ||abs(pdgId)== 12 || abs(pdgId)== 14 || abs(pdgId)== 16|| abs(pdgId)== 24|| pdgId== 23)"