| Index: src/flag-definitions.h
 | 
| diff --git a/src/flag-definitions.h b/src/flag-definitions.h
 | 
| index 6c5cf35964f592d983183397196be35ae97a7714..5a44b609aa10ad0fd7247cee862206f7815f7c73 100644
 | 
| --- a/src/flag-definitions.h
 | 
| +++ b/src/flag-definitions.h
 | 
| @@ -666,7 +666,7 @@ DEFINE_BOOL(age_code, true,
 | 
|  DEFINE_BOOL(incremental_marking, true, "use incremental marking")
 | 
|  DEFINE_BOOL(incremental_marking_wrappers, true,
 | 
|              "use incremental marking for marking wrappers")
 | 
| -DEFINE_BOOL(concurrent_marking, false, "use concurrent marking")
 | 
| +DEFINE_BOOL(concurrent_marking, V8_CONCURRENT_MARKING, "use concurrent marking")
 | 
|  DEFINE_BOOL(trace_concurrent_marking, false, "trace concurrent marking")
 | 
|  DEFINE_INT(min_progress_during_incremental_marking_finalization, 32,
 | 
|             "keep finalizing incremental marking as long as we discover at "
 | 
| 
 |