--- old/src/share/vm/gc/shenandoah/shenandoahPartialGC.cpp	2017-10-09 11:48:36.386339231 +0200
+++ new/src/share/vm/gc/shenandoah/shenandoahPartialGC.cpp	2017-10-09 11:48:36.278338965 +0200
@@ -159,9 +159,9 @@
     ShenandoahHeapRegion* r = cset->claim_next();
     while (r != NULL) {
       HeapWord* bottom = r->bottom();
-      HeapWord* top = _heap->complete_top_at_mark_start(r->bottom());
+      HeapWord* top = _heap->top_at_mark_start(r->bottom());
       if (top > bottom) {
-        _heap->complete_mark_bit_map()->clear_range_large(MemRegion(bottom, top));
+        _heap->mark_bit_map()->clear_range_large(MemRegion(bottom, top));
       }
       r = cset->claim_next();
     }