diff --git a/interface/ElectronsProducer.h b/interface/ElectronsProducer.h
index 2e03f37..9ffc882 100644
--- a/interface/ElectronsProducer.h
+++ b/interface/ElectronsProducer.h
@@ -52,6 +52,8 @@ class ElectronsProducer: public LeptonsProducer<pat::Electron>, public Identifia
         BRANCH(hcalPFClusterIso, std::vector<float>);
         BRANCH(trackIso, std::vector<float>);
 
+        BRANCH(expectedMissingInnerHits, std::vector<unsigned int>);
+
         BRANCH(mva_id_values, std::vector<float>);
         BRANCH(mva_id_categories, std::vector<int>);
 
diff --git a/src/ElectronsProducer.cc b/src/ElectronsProducer.cc
index 852bc12..4a55efc 100644
--- a/src/ElectronsProducer.cc
+++ b/src/ElectronsProducer.cc
@@ -56,6 +56,8 @@ void ElectronsProducer::produce(edm::Event& event, const edm::EventSetup& eventS
         ecalPFClusterIso.push_back(electron.ecalPFClusterIso());
         hcalPFClusterIso.push_back(electron.hcalPFClusterIso());
         trackIso.push_back(electron.trackIso());
+        // see https://github.com/latinos/LatinoTrees/blob/cc89e18d1a956f633cf59a7143f24491716d1047/DataFormats/src/SkimEvent.cc#L5831
+        expectedMissingInnerHits.push_back(electron.gsfTrack()->hitPattern().numberOfHits(reco::HitPattern::MISSING_INNER_HITS));
 
         // MVA id
         if (! m_mva_id_values_map_token.isUninitialized()) {
diff --git a/test/unit_tests_data_ref.root b/test/unit_tests_data_ref.root
index 79ec256..b5d1f78 100644
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diff --git a/test/unit_tests_mc_ref.root b/test/unit_tests_mc_ref.root
index c390ee6..6d1d161 100644
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diff --git a/test/unit_tests_mc_with_db_ref.root b/test/unit_tests_mc_with_db_ref.root
index 188d5c4..faaffa3 100644
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