diff --git a/src/assembler_arm.h b/src/assembler_arm.h
index 1a722f7..577fd55 100644
--- a/src/assembler_arm.h
+++ b/src/assembler_arm.h
@@ -481,6 +481,8 @@
   virtual void Copy(FrameOffset dest, FrameOffset src, ManagedRegister scratch,
                     unsigned int size);
 
+  virtual void MemoryBarrier(ManagedRegister scratch);
+
   // Exploit fast access in managed code to Thread::Current()
   virtual void GetCurrentThread(ManagedRegister tr);
   virtual void GetCurrentThread(FrameOffset dest_offset,