--- jsr166/src/test/tck/JSR166TestCase.java	2016/11/05 16:09:50	1.208
+++ 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,
@@ -1836,7 +1836,7 @@ public class JSR166TestCase extends Test
                         ((Collection) o).add(null);}});
         }
     }
-    
+
     @SuppressWarnings("unchecked")
     <T> T serialClone(T o) {
         try {