--- old/src/hotspot/share/gc/shenandoah/shenandoahAsserts.cpp	2020-01-24 15:21:04.484478630 +0100
+++ new/src/hotspot/share/gc/shenandoah/shenandoahAsserts.cpp	2020-01-24 15:21:04.196473789 +0100
@@ -67,7 +67,7 @@
   ShenandoahMarkingContext* const ctx = heap->marking_context();
 
   msg.append("  " PTR_FORMAT " - klass " PTR_FORMAT " %s\n", p2i(obj), p2i(obj->klass()), obj->klass()->external_name());
-  msg.append("    %3s allocated after mark start\n", ctx->allocated_after_mark_start(obj) ? "" : "not");
+  msg.append("    %3s allocated after mark start\n", ctx->allocated_after_mark_start(cast_from_oop<HeapWord*>(obj)) ? "" : "not");
   msg.append("    %3s marked \n",                    ctx->is_marked(obj) ? "" : "not");
   msg.append("    %3s in collection set\n",          heap->in_collection_set(obj) ? "" : "not");
   if (heap->traversal_gc() != NULL) {