diff --git a/FWCore/Sources/interface/ProducerSourceBase.h b/FWCore/Sources/interface/ProducerSourceBase.h
index 8a3c4309fa331..898580dbaa2e4 100644
--- a/FWCore/Sources/interface/ProducerSourceBase.h
+++ b/FWCore/Sources/interface/ProducerSourceBase.h
@@ -19,7 +19,7 @@ namespace edm {
   class ParameterSetDescription;
   class ProducerSourceBase : public InputSource {
   public:
-    explicit ProducerSourceBase(ParameterSet const& pset, InputSourceDescription const& desc, bool realData);
+    explicit ProducerSourceBase(ParameterSet const& pset, InputSourceDescription const& desc, bool realData, EventAuxiliary::ExperimentType eType = EventAuxiliary::Undefined);
     virtual ~ProducerSourceBase();
 
     unsigned int numberEventsInRun() const {return numberEventsInRun_;} 
@@ -38,6 +38,8 @@ namespace edm {
 
   protected:
 
+    void setExperimentType(EventAuxiliary::ExperimentType eType);
+
   private:
     virtual ItemType getNextItemType() override;
     virtual void initialize(EventID& id, TimeValue_t& time, TimeValue_t& interval);
diff --git a/FWCore/Sources/interface/ProducerSourceFromFiles.h b/FWCore/Sources/interface/ProducerSourceFromFiles.h
index 117d8586877e2..5ba02c0288450 100644
--- a/FWCore/Sources/interface/ProducerSourceFromFiles.h
+++ b/FWCore/Sources/interface/ProducerSourceFromFiles.h
@@ -16,7 +16,7 @@ namespace edm {
 
   class ProducerSourceFromFiles : public ProducerSourceBase, private FromFiles {
   public:
-    ProducerSourceFromFiles(ParameterSet const& pset, InputSourceDescription const& desc, bool realData);
+    ProducerSourceFromFiles(ParameterSet const& pset, InputSourceDescription const& desc, bool realData, EventAuxiliary::ExperimentType eType = EventAuxiliary::Undefined);
     virtual ~ProducerSourceFromFiles();
 
     using FromFiles::logicalFileNames;
diff --git a/FWCore/Sources/src/ProducerSourceBase.cc b/FWCore/Sources/src/ProducerSourceBase.cc
index 8871efd88001e..f557d0e98303b 100644
--- a/FWCore/Sources/src/ProducerSourceBase.cc
+++ b/FWCore/Sources/src/ProducerSourceBase.cc
@@ -17,7 +17,9 @@ namespace edm {
   static unsigned long long const kAveEventPerSec = 200ULL;
   
   ProducerSourceBase::ProducerSourceBase(ParameterSet const& pset,
-				       InputSourceDescription const& desc, bool realData) :
+				         InputSourceDescription const& desc,
+                                         bool realData,
+                                         EventAuxiliary::ExperimentType eType) :
       InputSource(pset, desc),
       numberEventsInRun_(pset.getUntrackedParameter<unsigned int>("numberEventsInRun", remainingEvents())),
       numberEventsInLumi_(pset.getUntrackedParameter<unsigned int>("numberEventsInLuminosityBlock", remainingEvents())),
@@ -32,7 +34,7 @@ namespace edm {
       eventID_(pset.getUntrackedParameter<unsigned int>("firstRun", 1), pset.getUntrackedParameter<unsigned int>("firstLuminosityBlock", 1), zerothEvent_),
       origEventID_(eventID_),
       isRealData_(realData),
-      eType_(EventAuxiliary::Undefined) {
+      eType_(eType) {
 
     setTimestamp(Timestamp(presentTime_));
     // We need to map this string to the EventAuxiliary::ExperimentType enumeration
@@ -88,6 +90,11 @@ namespace edm {
     }
   }
 
+  void
+  ProducerSourceBase::setExperimentType(EventAuxiliary::ExperimentType eType) {
+    eType_ = eType;
+  }
+
   void
   ProducerSourceBase::beginJob() {
     // initialize cannot be called from the constructor, because it is a virtual function
diff --git a/FWCore/Sources/src/ProducerSourceFromFiles.cc b/FWCore/Sources/src/ProducerSourceFromFiles.cc
index 5561e3076be0e..545d01a7f59e3 100644
--- a/FWCore/Sources/src/ProducerSourceFromFiles.cc
+++ b/FWCore/Sources/src/ProducerSourceFromFiles.cc
@@ -3,8 +3,8 @@
 #include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
 
 namespace edm {
-  ProducerSourceFromFiles::ProducerSourceFromFiles(ParameterSet const& pset, InputSourceDescription const& desc, bool realData) :
-    ProducerSourceBase(pset, desc, realData),
+  ProducerSourceFromFiles::ProducerSourceFromFiles(ParameterSet const& pset, InputSourceDescription const& desc, bool realData, EventAuxiliary::ExperimentType eType) :
+    ProducerSourceBase(pset, desc, realData, eType),
     FromFiles(pset) {
   }