diff --git a/src/main/java/org/apache/commons/collections4/map/AbstractHashedMap.java b/src/main/java/org/apache/commons/collections4/map/AbstractHashedMap.java
index 8508180e28..a7a54081a2 100644
--- a/src/main/java/org/apache/commons/collections4/map/AbstractHashedMap.java
+++ b/src/main/java/org/apache/commons/collections4/map/AbstractHashedMap.java
@@ -1306,7 +1306,7 @@ protected AbstractHashedMap<K, V> clone() {
             cloned.putAll(this);
             return cloned;
         } catch (final CloneNotSupportedException ex) {
-            throw new InternalError();
+            throw new UnsupportedOperationException(ex);
         }
     }
 
diff --git a/src/main/java/org/apache/commons/collections4/map/Flat3Map.java b/src/main/java/org/apache/commons/collections4/map/Flat3Map.java
index 4ac53fcaa8..4666a79392 100644
--- a/src/main/java/org/apache/commons/collections4/map/Flat3Map.java
+++ b/src/main/java/org/apache/commons/collections4/map/Flat3Map.java
@@ -1155,7 +1155,7 @@ public Flat3Map<K, V> clone() {
             }
             return cloned;
         } catch (final CloneNotSupportedException ex) {
-            throw new InternalError();
+            throw new UnsupportedOperationException(ex);
         }
     }
 
diff --git a/src/main/java/org/apache/commons/collections4/map/MultiKeyMap.java b/src/main/java/org/apache/commons/collections4/map/MultiKeyMap.java
index 0250f3f368..64b38a50a3 100644
--- a/src/main/java/org/apache/commons/collections4/map/MultiKeyMap.java
+++ b/src/main/java/org/apache/commons/collections4/map/MultiKeyMap.java
@@ -828,7 +828,7 @@ public MultiKeyMap<K, V> clone() {
         try {
             return (MultiKeyMap<K, V>) super.clone();
         } catch (final CloneNotSupportedException e) {
-            throw new InternalError();
+            throw new UnsupportedOperationException(e);
         }
     }
 
diff --git a/src/main/java/org/apache/commons/collections4/map/SingletonMap.java b/src/main/java/org/apache/commons/collections4/map/SingletonMap.java
index d952f1d090..c76917c857 100644
--- a/src/main/java/org/apache/commons/collections4/map/SingletonMap.java
+++ b/src/main/java/org/apache/commons/collections4/map/SingletonMap.java
@@ -538,7 +538,7 @@ public SingletonMap<K, V> clone() {
         try {
             return (SingletonMap<K, V>) super.clone();
         } catch (final CloneNotSupportedException ex) {
-            throw new InternalError();
+            throw new UnsupportedOperationException(ex);
         }
     }