--- a/src/hotspot/share/gc/parallel/psParallelCompact.cpp	Tue May 29 12:06:05 2018 -0700
+++ b/src/hotspot/share/gc/parallel/psParallelCompact.cpp	Tue May 29 15:50:27 2018 -0400
@@ -2139,7 +2139,7 @@
     GCTraceTime(Debug, gc, phases) tm_m("Class Unloading", &_gc_timer);
 
     // Follow system dictionary roots and unload classes.
-    bool purged_class = SystemDictionary::do_unloading(is_alive_closure(), &_gc_timer);
+    bool purged_class = SystemDictionary::do_unloading(&_gc_timer);
 
     // Unload nmethods.
     CodeCache::do_unloading(is_alive_closure(), purged_class);