diff --git a/src/test/org/apache/commons/collections/collection/AbstractTestCollection.java b/src/test/org/apache/commons/collections/collection/AbstractTestCollection.java

index dfde362..00c5d26 100644

--- a/src/test/org/apache/commons/collections/collection/AbstractTestCollection.java

+++ b/src/test/org/apache/commons/collections/collection/AbstractTestCollection.java

@@ -1116,7 +1116,7 @@ public abstract class AbstractTestCollection extends AbstractTestObject {

         verify();

         try {

-            array = collection.toArray(null);

+            array = collection.toArray((Object[])null);

             fail("toArray(null) should raise NPE");

         } catch (NullPointerException e) {

             // expected