--- old/src/hotspot/share/gc/g1/g1IHOPControl.hpp	2020-02-11 11:34:47.739188904 +0100
+++ new/src/hotspot/share/gc/g1/g1IHOPControl.hpp	2020-02-11 11:34:47.328176268 +0100
@@ -90,10 +90,7 @@
  public:
   G1StaticIHOPControl(double ihop_percent);
 
-  size_t get_conc_mark_start_threshold() {
-    guarantee(_target_occupancy > 0, "Target occupancy must have been initialized.");
-    return (size_t) (_initial_ihop_percent * _target_occupancy / 100.0);
-  }
+  size_t get_conc_mark_start_threshold();
 
   virtual void update_marking_length(double marking_length_s) {
    assert(marking_length_s > 0.0, "Marking length must be larger than zero but is %.3f", marking_length_s);