--- a/hotspot/src/share/vm/gc_implementation/g1/heapRegion.hpp	Fri Apr 17 10:46:41 2015 +0200
+++ b/hotspot/src/share/vm/gc_implementation/g1/heapRegion.hpp	Fri Apr 17 11:46:56 2015 +0200
@@ -44,6 +44,7 @@
 // The solution is to remove this method from the definition
 // of a Space.
 
+class G1CollectedHeap;
 class HeapRegionRemSet;
 class HeapRegionRemSetIterator;
 class HeapRegion;