diff -r 78b0d3d2f7b5 -r 09ed30a4bfae src/hotspot/share/gc/shenandoah/shenandoahJfrSupport.cpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahJfrSupport.cpp	Tue Sep 17 13:59:11 2019 +0200
+++ b/src/hotspot/share/gc/shenandoah/shenandoahJfrSupport.cpp	Tue Sep 17 19:07:01 2019 +0200
@@ -47,7 +47,6 @@
 
 void ShenandoahJFRSupport::register_jfr_type_serializers() {
   JfrSerializer::register_serializer(TYPE_SHENANDOAHHEAPREGIONSTATE,
-                                     false,
                                      true,
                                      new ShenandoahHeapRegionStateConstant());
 }