--- a/src/hotspot/share/runtime/handles.hpp	Thu Jan 31 01:17:41 2019 +0100
+++ b/src/hotspot/share/runtime/handles.hpp	Thu Jan 31 10:31:39 2019 +0100
@@ -31,6 +31,7 @@
 
 class InstanceKlass;
 class Klass;
+class Thread;
 
 //------------------------------------------------------------------------------------------------------------------------
 // In order to preserve oops during garbage collection, they should be