diff --git a/src/main/java/org/apache/commons/collections4/map/AbstractReferenceMap.java b/src/main/java/org/apache/commons/collections4/map/AbstractReferenceMap.java
index 84fd2d992..4fd244583 100644
--- a/src/main/java/org/apache/commons/collections4/map/AbstractReferenceMap.java
+++ b/src/main/java/org/apache/commons/collections4/map/AbstractReferenceMap.java
@@ -795,7 +795,7 @@ public abstract class AbstractReferenceMap<K, V> extends AbstractHashedMap<K, V>
 
         ReferenceBaseIterator(final AbstractReferenceMap<K, V> parent) {
             this.parent = parent;
-            index = parent.size() != 0 ? parent.data.length : 0;
+            index = !parent.isEmpty() ? parent.data.length : 0;
             // have to do this here!  size() invocation above
             // may have altered the modCount.
             expectedModCount = parent.modCount;
diff --git a/src/main/java/org/apache/commons/collections4/map/CompositeMap.java b/src/main/java/org/apache/commons/collections4/map/CompositeMap.java
index 3aad89102..c9bffcf87 100644
--- a/src/main/java/org/apache/commons/collections4/map/CompositeMap.java
+++ b/src/main/java/org/apache/commons/collections4/map/CompositeMap.java
@@ -139,7 +139,7 @@ public class CompositeMap<K, V> extends AbstractIterableMap<K, V> implements Ser
         if (map != null) {
             for (int i = composite.length - 1; i >= 0; --i) {
                 final Collection<K> intersect = CollectionUtils.intersection(this.composite[i].keySet(), map.keySet());
-                if (intersect.size() != 0) {
+                if (!intersect.isEmpty()) {
                     if (this.mutator == null) {
                         throw new IllegalArgumentException("Key collision adding Map to CompositeMap");
                     }