--- old/test/jdk/java/util/concurrent/tck/Collection8Test.java	2017-12-07 14:44:13.000000000 -0800
+++ new/test/jdk/java/util/concurrent/tck/Collection8Test.java	2017-12-07 14:44:12.000000000 -0800
@@ -189,7 +189,7 @@
             () -> c.iterator().forEachRemaining(null),
             () -> c.spliterator().forEachRemaining(null),
             () -> c.spliterator().tryAdvance(null),
-            () -> c.toArray(null));
+            () -> c.toArray((Object[])null));
 
         if (!impl.permitsNulls()) {
             assertThrows(