--- old/src/hotspot/share/gc/shared/gcCause.hpp	2018-10-18 16:42:39.722483341 +0200
+++ new/src/hotspot/share/gc/shared/gcCause.hpp	2018-10-18 16:42:39.298470290 +0200
@@ -75,6 +75,7 @@
 
     _g1_inc_collection_pause,
     _g1_humongous_allocation,
+    _g1_periodic_collection,
 
     _dcmd_gc_run,