--- old/src/hotspot/share/gc/parallel/psParallelCompact.hpp	2017-10-13 18:25:43.856156493 -0400
+++ new/src/hotspot/share/gc/parallel/psParallelCompact.hpp	2017-10-13 18:25:43.487040031 -0400
@@ -586,7 +586,7 @@
 #ifdef ASSERT
   HeapWord* tmp = _highest_ref;
   while (addr > tmp) {
-    tmp = (HeapWord*)Atomic::cmpxchg_ptr(addr, &_highest_ref, tmp);
+    tmp = Atomic::cmpxchg(addr, &_highest_ref, tmp);
   }
 #endif  // #ifdef ASSERT
 }