| Index: src/zone.h | 
| diff --git a/src/zone.h b/src/zone.h | 
| index a690b8d8caf1bb6ec3144908f37b4e8736c982d8..6f552b6524413c08172d25e6fd8c70ca2b27f85a 100644 | 
| --- a/src/zone.h | 
| +++ b/src/zone.h | 
| @@ -63,9 +63,9 @@ class Zone { | 
|  | 
| inline void adjust_segment_bytes_allocated(int delta); | 
|  | 
| -  inline unsigned allocation_size() { return allocation_size_; } | 
| +  inline unsigned allocation_size() const { return allocation_size_; } | 
|  | 
| -  inline Isolate* isolate() { return isolate_; } | 
| +  inline Isolate* isolate() const { return isolate_; } | 
|  | 
| private: | 
| friend class Isolate; | 
|  |