| Index: src/incremental-marking.cc | 
| diff --git a/src/incremental-marking.cc b/src/incremental-marking.cc | 
| index 49936d7ce8fe2a5f651dc4636d5a82f26bc2b8a8..4223dde211e4030b858c6fbe87816107642ac638 100644 | 
| --- a/src/incremental-marking.cc | 
| +++ b/src/incremental-marking.cc | 
| @@ -728,7 +728,7 @@ void IncrementalMarking::VisitObject(Map* map, HeapObject* obj, int size) { | 
| IncrementalMarkingMarkingVisitor::IterateBody(map, obj); | 
|  | 
| MarkBit mark_bit = Marking::MarkBitFrom(obj); | 
| -#ifdef DEBUG | 
| +#if ENABLE_SLOW_ASSERTS | 
| MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address()); | 
| SLOW_ASSERT(Marking::IsGrey(mark_bit) || | 
| (obj->IsFiller() && Marking::IsWhite(mark_bit)) || | 
|  |