--- a/src/hotspot/share/gc/g1/g1GCPhaseTimes.hpp	Mon Mar 04 11:49:16 2019 +0100
+++ b/src/hotspot/share/gc/g1/g1GCPhaseTimes.hpp	Mon Mar 04 11:49:16 2019 +0100
@@ -81,6 +81,9 @@
     GCParPhasesSentinel
   };
 
+  static const GCParPhases ExtRootScanSubPhasesStart = ThreadRoots;
+  static const GCParPhases ExtRootScanSubPhasesEnd = SATBFiltering;
+
   enum GCScanRSWorkItems {
     ScanRSScannedCards,
     ScanRSClaimedCards,