diff --git a/src/test/java/org/apache/commons/collections4/collection/AbstractCollectionTest.java b/src/test/java/org/apache/commons/collections4/collection/AbstractCollectionTest.java
index 71e55adb5..c18130953 100644
--- a/src/test/java/org/apache/commons/collections4/collection/AbstractCollectionTest.java
+++ b/src/test/java/org/apache/commons/collections4/collection/AbstractCollectionTest.java
@@ -1084,7 +1084,8 @@ public abstract class AbstractCollectionTest<E> extends AbstractObjectTest {
         verify();
 
         try {
-            array = getCollection().toArray(null);
+            // Casting to Object[] allows compilation on Java 11.
+            array = getCollection().toArray((Object[]) null);
             fail("toArray(null) should raise NPE");
         } catch (final NullPointerException e) {
             // expected