diff --git a/src/algorithms/calorimetry/CalorimeterIslandCluster.h b/src/algorithms/calorimetry/CalorimeterIslandCluster.h
index b118c33fd0..826a1b8296 100644
--- a/src/algorithms/calorimetry/CalorimeterIslandCluster.h
+++ b/src/algorithms/calorimetry/CalorimeterIslandCluster.h
@@ -194,7 +194,7 @@ class CalorimeterIslandCluster {
           continue;
         }
 
-        if (is_neighbour(hit, hit2) && hit2->getEnergy() > hit->getEnergy()) {
+        if (is_neighbour(hit, hit2) && (hit2->getEnergy() > hit->getEnergy())) {
           maximum = false;
           break;
         }