diff --git a/RecoLocalCalo/HGCalRecProducers/plugins/HGCalCLUEAlgo.h b/RecoLocalCalo/HGCalRecProducers/plugins/HGCalCLUEAlgo.h
index 861447e874b0c..bfca51b3c0384 100644
--- a/RecoLocalCalo/HGCalRecProducers/plugins/HGCalCLUEAlgo.h
+++ b/RecoLocalCalo/HGCalRecProducers/plugins/HGCalCLUEAlgo.h
@@ -72,6 +72,7 @@ class HGCalCLUEAlgoT : public HGCalClusteringAlgoBase {
       cells.clear();
       cells.shrink_to_fit();
     }
+    density_.clear();
   }
 
   Density getDensity() override;