--- old/src/hotspot/share/gc/parallel/parMarkBitMap.cpp	2017-10-10 17:31:22.714879171 -0400
+++ new/src/hotspot/share/gc/parallel/parMarkBitMap.cpp	2017-10-10 17:31:22.263776547 -0400
@@ -90,7 +90,7 @@
     bool end_bit_ok = _end_bits.par_set_bit(end_bit);
     assert(end_bit_ok, "concurrency problem");
     DEBUG_ONLY(Atomic::inc(&mark_bitmap_count));
-    DEBUG_ONLY(Atomic::add_ptr(size, &mark_bitmap_size));
+    DEBUG_ONLY(Atomic::add(size, &mark_bitmap_size));
     return true;
   }
   return false;