diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/properties/UnorderedPartitionedProperty.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/properties/UnorderedPartitionedProperty.java
index e07cf15..5966407 100644
--- a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/properties/UnorderedPartitionedProperty.java
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/properties/UnorderedPartitionedProperty.java
@@ -19,11 +19,11 @@
 package org.apache.hyracks.algebricks.core.algebra.properties;
 
 import java.util.Collection;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
+import org.apache.hyracks.algebricks.common.utils.ListSet;
 import org.apache.hyracks.algebricks.core.algebra.base.EquivalenceClass;
 import org.apache.hyracks.algebricks.core.algebra.base.LogicalVariable;
 
@@ -80,7 +80,7 @@
 
     @Override
     public IPartitioningProperty clonePartitioningProperty() {
-        return new UnorderedPartitionedProperty(new HashSet<>(columnSet), domain);
+        return new UnorderedPartitionedProperty(new ListSet<>(columnSet), domain);
     }
 
 }