diff -r 2c3cc4b01880 -r c16ac7a2eba4 src/hotspot/share/gc/shenandoah/shenandoahJfrSupport.cpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahJfrSupport.cpp	Wed Oct 30 16:14:56 2019 +0100
+++ b/src/hotspot/share/gc/shenandoah/shenandoahJfrSupport.cpp	Wed Oct 30 19:43:52 2019 +0100
@@ -47,7 +47,6 @@
 
 void ShenandoahJFRSupport::register_jfr_type_serializers() {
   JfrSerializer::register_serializer(TYPE_SHENANDOAHHEAPREGIONSTATE,
-                                     false,
                                      true,
                                      new ShenandoahHeapRegionStateConstant());
 }