--- a/src/hotspot/share/gc/parallel/pcTasks.cpp	Tue Oct 16 13:14:18 2018 +0200
+++ b/src/hotspot/share/gc/parallel/pcTasks.cpp	Tue Oct 16 13:16:11 2018 +0200
@@ -110,7 +110,7 @@
       break;
 
     case class_loader_data: {
-        CLDToOopClosure cld_closure(&mark_and_push_closure);
+        CLDToOopClosure cld_closure(&mark_and_push_closure, ClassLoaderData::_claim_strong);
         ClassLoaderDataGraph::always_strong_cld_do(&cld_closure);
       }
       break;