diff --git a/RecoHGCal/TICL/plugins/PatternRecognitionbyCLUE3D.cc b/RecoHGCal/TICL/plugins/PatternRecognitionbyCLUE3D.cc
index 8470bbea04675..4af6e422698c9 100644
--- a/RecoHGCal/TICL/plugins/PatternRecognitionbyCLUE3D.cc
+++ b/RecoHGCal/TICL/plugins/PatternRecognitionbyCLUE3D.cc
@@ -532,7 +532,7 @@ void PatternRecognitionbyCLUE3D<TILES>::calculateLocalDensity(
       const int etaWindow = 2;
       const int phiWindow = 2;
       int etaBinMin = std::max(tileOnLayer.etaBin(clustersOnLayer.eta[i]) - etaWindow, 0);
-      int etaBinMax = std::min(tileOnLayer.etaBin(clustersOnLayer.eta[i]) + etaWindow, nEtaBin);
+      int etaBinMax = std::min(tileOnLayer.etaBin(clustersOnLayer.eta[i]) + etaWindow, nEtaBin - 1);
       int phiBinMin = tileOnLayer.phiBin(clustersOnLayer.phi[i]) - phiWindow;
       int phiBinMax = tileOnLayer.phiBin(clustersOnLayer.phi[i]) + phiWindow;
       if (PatternRecognitionAlgoBaseT<TILES>::algo_verbosity_ > VerbosityLevel::Advanced) {
@@ -686,7 +686,7 @@ void PatternRecognitionbyCLUE3D<TILES>::calculateDistanceToHigher(
       int etaWindow = 1;
       int phiWindow = 1;
       int etaBinMin = std::max(tileOnLayer.etaBin(clustersOnLayer.eta[i]) - etaWindow, 0);
-      int etaBinMax = std::min(tileOnLayer.etaBin(clustersOnLayer.eta[i]) + etaWindow, nEtaBin);
+      int etaBinMax = std::min(tileOnLayer.etaBin(clustersOnLayer.eta[i]) + etaWindow, nEtaBin - 1);
       int phiBinMin = tileOnLayer.phiBin(clustersOnLayer.phi[i]) - phiWindow;
       int phiBinMax = tileOnLayer.phiBin(clustersOnLayer.phi[i]) + phiWindow;
       for (int ieta = etaBinMin; ieta <= etaBinMax; ++ieta) {