diff --git a/runtime/gc/heap.h b/runtime/gc/heap.h
index 52138d1..fd7a614 100644
--- a/runtime/gc/heap.h
+++ b/runtime/gc/heap.h
@@ -467,6 +467,9 @@
   void MarkAllocStackAsLive(accounting::ObjectStack* stack)
       EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_);
 
+  // Unbind any bound bitmaps.
+  void UnBindBitmaps() EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_);
+
   // DEPRECATED: Should remove in "near" future when support for multiple image spaces is added.
   // Assumes there is only one image space.
   space::ImageSpace* GetImageSpace() const;