--- old/src/hotspot/share/gc/g1/g1CollectionSet.hpp	2018-11-27 18:26:13.516017347 +0100
+++ new/src/hotspot/share/gc/g1/g1CollectionSet.hpp	2018-11-27 18:26:13.092015244 +0100
@@ -32,6 +32,7 @@
 class G1CollectedHeap;
 class G1CollectorState;
 class G1GCPhaseTimes;
+class G1ParScanThreadStateSet;
 class G1Policy;
 class G1SurvivorRegions;
 class HeapRegion;
@@ -234,6 +235,7 @@
 class G1OptionalCSet : public StackObj {
 private:
   G1CollectionSet* _cset;
+  G1ParScanThreadStateSet* _pset;
   uint _current_index;
   uint _current_limit;
   bool _prepare_failed;
@@ -244,8 +246,9 @@
 public:
   static const uint InvalidCSetIndex = UINT_MAX;
 
-  G1OptionalCSet(G1CollectionSet* cset) :
+  G1OptionalCSet(G1CollectionSet* cset, G1ParScanThreadStateSet* pset) :
     _cset(cset),
+    _pset(pset),
     _current_index(0),
     _current_limit(0),
     _prepare_failed(false),