diff --git a/runtime/Android.mk b/runtime/Android.mk
index d104077..8a4b8c0 100644
--- a/runtime/Android.mk
+++ b/runtime/Android.mk
@@ -64,6 +64,7 @@
   gc/space/image_space.cc \
   gc/space/large_object_space.cc \
   gc/space/malloc_space.cc \
+  gc/space/region_space.cc \
   gc/space/rosalloc_space.cc \
   gc/space/space.cc \
   gc/space/zygote_space.cc \