--- old/src/hotspot/share/gc/g1/g1ConcurrentMark.cpp	2018-11-05 13:20:40.846645976 +0100
+++ new/src/hotspot/share/gc/g1/g1ConcurrentMark.cpp	2018-11-05 13:20:40.422632904 +0100
@@ -1655,7 +1655,7 @@
   // Unload Klasses, String, Code Cache, etc.
   if (ClassUnloadingWithConcurrentMark) {
     GCTraceTime(Debug, gc, phases) debug("Class Unloading", _gc_timer_cm);
-    bool purged_classes = SystemDictionary::do_unloading(_gc_timer_cm, false /* Defer cleaning */);
+    bool purged_classes = SystemDictionary::do_unloading(_gc_timer_cm);
     _g1h->complete_cleaning(&g1_is_alive, purged_classes);
   } else {
     GCTraceTime(Debug, gc, phases) debug("Cleanup", _gc_timer_cm);