--- a/src/hotspot/share/gc/z/zDriver.cpp	Wed May 22 21:49:31 2019 -0700
+++ b/src/hotspot/share/gc/z/zDriver.cpp	Thu May 23 08:09:29 2019 +0200
@@ -234,6 +234,7 @@
   case GCCause::_z_allocation_rate:
   case GCCause::_z_allocation_stall:
   case GCCause::_z_proactive:
+  case GCCause::_z_high_usage:
   case GCCause::_metadata_GC_threshold:
     // Start asynchronous GC
     _gc_cycle_port.send_async(cause);