diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index 99fde75..75cdb3e 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -1839,7 +1839,7 @@
     }
   }
 
-  void CopyFrom(const ArenaVector<HInstruction*>& locals);
+  void CopyFrom(ArrayRef<HInstruction* const> locals);
   void CopyFrom(HEnvironment* environment);
 
   // Copy from `env`. If it's a loop phi for `loop_header`, copy the first