--- old/src/hotspot/share/memory/metaspace.hpp	2018-03-15 12:08:10.631592485 -0400
+++ new/src/hotspot/share/memory/metaspace.hpp	2018-03-15 12:08:10.012535668 -0400
@@ -66,6 +66,7 @@
 class PrintCLDMetaspaceInfoClosure;
 class SpaceManager;
 class VirtualSpaceList;
+class CollectedHeap;
 
 // Metaspaces each have a  SpaceManager and allocations
 // are done by the SpaceManager.  Allocations are done