diff --git a/compiler/image_writer.h b/compiler/image_writer.h
index dba9dd7..f204b28 100644
--- a/compiler/image_writer.h
+++ b/compiler/image_writer.h
@@ -443,7 +443,7 @@
 
   static Bin BinTypeForNativeRelocationType(NativeObjectRelocationType type);
 
-  uintptr_t NativeOffsetInImage(void* obj);
+  uintptr_t NativeOffsetInImage(void* obj) SHARED_REQUIRES(Locks::mutator_lock_);
 
   // Location of where the object will be when the image is loaded at runtime.
   template <typename T>