--- old/src/hotspot/share/gc/shared/generation.cpp	2018-02-20 23:17:53.289047600 +0100
+++ new/src/hotspot/share/gc/shared/generation.cpp	2018-02-20 23:17:53.057039669 +0100
@@ -34,6 +34,8 @@
 #include "gc/shared/genOopClosures.hpp"
 #include "gc/shared/genOopClosures.inline.hpp"
 #include "gc/shared/generation.hpp"
+#include "gc/shared/generationSpec.hpp"
+#include "gc/shared/referenceProcessor.hpp"
 #include "gc/shared/space.inline.hpp"
 #include "gc/shared/spaceDecorator.hpp"
 #include "logging/log.hpp"
@@ -63,9 +65,9 @@
 size_t Generation::initial_size() {
   GenCollectedHeap* gch = GenCollectedHeap::heap();
   if (gch->is_young_gen(this)) {
-    return gch->gen_policy()->young_gen_spec()->init_size();
+    return gch->young_gen_spec()->init_size();
   }
-  return gch->gen_policy()->old_gen_spec()->init_size();
+  return gch->old_gen_spec()->init_size();
 }
 
 size_t Generation::max_capacity() const {