--- old/src/hotspot/share/gc/g1/g1RemSet.cpp	2017-11-20 12:10:04.739368262 +0100
+++ new/src/hotspot/share/gc/g1/g1RemSet.cpp	2017-11-20 12:10:04.338356088 +0100
@@ -298,7 +298,7 @@
 }
 
 uint G1RemSet::num_par_rem_sets() {
-  return MAX2(DirtyCardQueueSet::num_par_ids() + G1ConcurrentRefine::thread_num(), ParallelGCThreads);
+  return MAX2(DirtyCardQueueSet::num_par_ids() + G1ConcurrentRefine::max_num_threads(), ParallelGCThreads);
 }
 
 void G1RemSet::initialize(size_t capacity, uint max_regions) {