diff --git a/src/hotspot/share/gc/serial/generation.cpp b/src/hotspot/share/gc/serial/generation.cpp
index 1e9f4959ffb..0c011d813ba 100644
--- a/src/hotspot/share/gc/serial/generation.cpp
+++ b/src/hotspot/share/gc/serial/generation.cpp
@@ -25,12 +25,12 @@
 #include "precompiled.hpp"
 #include "gc/serial/cardTableRS.hpp"
 #include "gc/serial/generation.hpp"
+#include "gc/serial/serialHeap.hpp"
 #include "gc/shared/collectedHeap.inline.hpp"
 #include "gc/shared/continuationGCSupport.inline.hpp"
 #include "gc/shared/gcLocker.hpp"
 #include "gc/shared/gcTimer.hpp"
 #include "gc/shared/gcTrace.hpp"
-#include "gc/shared/genCollectedHeap.hpp"
 #include "gc/shared/generationSpec.hpp"
 #include "gc/shared/space.inline.hpp"
 #include "gc/shared/spaceDecorator.inline.hpp"
@@ -58,11 +58,11 @@ Generation::Generation(ReservedSpace rs, size_t initial_size) :
 }
 
 size_t Generation::initial_size() {
-  GenCollectedHeap* gch = GenCollectedHeap::heap();
-  if (gch->is_young_gen(this)) {
-    return gch->young_gen_spec()->init_size();
+  SerialHeap* serial_heap = SerialHeap::heap();
+  if (serial_heap->is_young_gen(this)) {
+    return serial_heap->young_gen_spec()->init_size();
   }
-  return gch->old_gen_spec()->init_size();
+  return serial_heap->old_gen_spec()->init_size();
 }
 
 size_t Generation::max_capacity() const {
@@ -86,7 +86,7 @@ void Generation::print_summary_info_on(outputStream* st) {
   double time = sr->accumulated_time.seconds();
   st->print_cr("Accumulated %s generation GC time %3.7f secs, "
                "%u GC's, avg GC time %3.7f",
-               GenCollectedHeap::heap()->is_young_gen(this) ? "young" : "old" ,
+               SerialHeap::heap()->is_young_gen(this) ? "young" : "old" ,
                time,
                sr->invocations,
                sr->invocations > 0 ? time / sr->invocations : 0.0);
@@ -116,8 +116,8 @@ size_t Generation::max_contiguous_available() const {
   // The largest number of contiguous free words in this or any higher generation.
   size_t avail = contiguous_available();
   size_t old_avail = 0;
-  if (GenCollectedHeap::heap()->is_young_gen(this)) {
-    old_avail = GenCollectedHeap::heap()->old_gen()->contiguous_available();
+  if (SerialHeap::heap()->is_young_gen(this)) {
+    old_avail = SerialHeap::heap()->old_gen()->contiguous_available();
   }
   return MAX2(avail, old_avail);
 }
@@ -135,7 +135,7 @@ oop Generation::promote(oop obj, size_t obj_size) {
   assert(obj_size == obj->size(), "bad obj_size passed in");
 
 #ifndef PRODUCT
-  if (GenCollectedHeap::heap()->promotion_should_fail()) {
+  if (SerialHeap::heap()->promotion_should_fail()) {
     return nullptr;
   }
 #endif  // #ifndef PRODUCT
@@ -236,8 +236,6 @@ void Generation::object_iterate(ObjectClosure* cl) {
   space_iterate(&blk);
 }
 
-#if INCLUDE_SERIALGC
-
 void Generation::prepare_for_compaction(CompactPoint* cp) {
   // Generic implementation, can be specialized
   ContiguousSpace* space = first_compaction_space();
@@ -268,5 +266,3 @@ void Generation::compact() {
     sp = sp->next_compaction_space();
   }
 }
-
-#endif // INCLUDE_SERIALGC
diff --git a/src/hotspot/share/gc/serial/generation.hpp b/src/hotspot/share/gc/serial/generation.hpp
index b005abc7a61..2c0f72012ac 100644
--- a/src/hotspot/share/gc/serial/generation.hpp
+++ b/src/hotspot/share/gc/serial/generation.hpp
@@ -54,7 +54,6 @@ class GenerationSpec;
 class ContiguousSpace;
 class CompactPoint;
 class OopClosure;
-class GenCollectedHeap;
 class GCStats;
 
 // A "ScratchBlock" represents a block of memory in one generation usable by
@@ -290,14 +289,12 @@ class Generation: public CHeapObj<mtGC> {
   GCStats* gc_stats() const { return _gc_stats; }
   virtual void update_gc_stats(Generation* current_generation, bool full) {}
 
-#if INCLUDE_SERIALGC
   // Mark sweep support phase2
   virtual void prepare_for_compaction(CompactPoint* cp);
   // Mark sweep support phase3
   virtual void adjust_pointers();
   // Mark sweep support phase4
   virtual void compact();
-#endif
 
   // Accessing "marks".