--- jsr166/src/test/tck/JSR166TestCase.java	2016/11/06 05:00:55	1.209
+++ jsr166/src/test/tck/JSR166TestCase.java	2016/11/07 01:59:17	1.210
@@ -1828,7 +1828,7 @@ public class JSR166TestCase extends Test
         }
     }
 
-    void assertImmutable(Object o) {
+    void assertImmutable(final Object o) {
         if (o instanceof Collection) {
             assertThrows(
                 UnsupportedOperationException.class,