diff --git a/MuonSpectrometer/MuonValidation/MuonDQA/MuonTrackMonitoring/src/MuonTrackMonitorAlgorithm.cxx b/MuonSpectrometer/MuonValidation/MuonDQA/MuonTrackMonitoring/src/MuonTrackMonitorAlgorithm.cxx
index 90589d86d63a2a347f5d42511cc8627a5de3642e..d18591933e2b7f128bb49c177b0376ea35f58e1c 100644
--- a/MuonSpectrometer/MuonValidation/MuonDQA/MuonTrackMonitoring/src/MuonTrackMonitorAlgorithm.cxx
+++ b/MuonSpectrometer/MuonValidation/MuonDQA/MuonTrackMonitoring/src/MuonTrackMonitorAlgorithm.cxx
@@ -13,6 +13,7 @@ StatusCode MuonTrackMonitorAlgorithm::initialize()
 {
 	ATH_CHECK(AthMonitorAlgorithm::initialize());
 	ATH_CHECK(m_MuonContainerKey.initialize());
+	ATH_CHECK(m_MuonIsoDecorKey.initialize());
 	return StatusCode::SUCCESS;
 }
 
diff --git a/MuonSpectrometer/MuonValidation/MuonDQA/MuonTrackMonitoring/src/MuonTrackMonitorAlgorithm.h b/MuonSpectrometer/MuonValidation/MuonDQA/MuonTrackMonitoring/src/MuonTrackMonitorAlgorithm.h
index 95e056cdf1499f678035ea1cc44f10cceff650ea..ea9352df58739183cb4e2eb24dd225c22dcc469a 100644
--- a/MuonSpectrometer/MuonValidation/MuonDQA/MuonTrackMonitoring/src/MuonTrackMonitorAlgorithm.h
+++ b/MuonSpectrometer/MuonValidation/MuonDQA/MuonTrackMonitoring/src/MuonTrackMonitorAlgorithm.h
@@ -28,6 +28,7 @@ class MuonTrackMonitorAlgorithm : public AthMonitorAlgorithm
   private:
 
     SG::ReadHandleKey<xAOD::MuonContainer> m_MuonContainerKey { this, "MuonContainerKey", "Muons", "Key for Muon Containers" };
+    SG::ReadDecorHandleKey<xAOD::MuonContainer> m_MuonIsoDecorKey { this, "MuonIsoDecorKey", "Muons.ptcone30" };
 
     // Toolds
     /// Fills data-quality information (e.g. pt, eta, phi..) to histograms for given selection of muons