--- old/src/hotspot/share/gc/parallel/asPSOldGen.hpp	2018-09-19 15:53:43.924002600 -0700
+++ new/src/hotspot/share/gc/parallel/asPSOldGen.hpp	2018-09-19 15:53:43.147929300 -0700
@@ -29,6 +29,7 @@
 #include "gc/parallel/objectStartArray.hpp"
 #include "gc/parallel/psOldGen.hpp"
 #include "gc/parallel/psVirtualspace.hpp"
+#include "gc/parallel/psFileBackedVirtualspace.hpp"
 #include "gc/parallel/spaceCounters.hpp"
 #include "gc/shared/generationCounters.hpp"