diff --git a/src/spaces-inl.h b/src/spaces-inl.h
index fbb2673..8a0dd07 100644
--- a/src/spaces-inl.h
+++ b/src/spaces-inl.h
@@ -407,8 +407,7 @@
 
 bool PagedSpace::Contains(Address addr) {
   Page* p = Page::FromAddress(addr);
-  ASSERT(p->is_valid());
-
+  if (!p->is_valid()) return false;
   return MemoryAllocator::IsPageInSpace(p, this);
 }
 
@@ -440,7 +439,7 @@
   object = SlowAllocateRaw(size_in_bytes);
   if (object != NULL) return object;
 
-  return Failure::RetryAfterGC(size_in_bytes, identity());
+  return Failure::RetryAfterGC(identity());
 }
 
 
@@ -454,7 +453,7 @@
   object = SlowMCAllocateRaw(size_in_bytes);
   if (object != NULL) return object;
 
-  return Failure::RetryAfterGC(size_in_bytes, identity());
+  return Failure::RetryAfterGC(identity());
 }
 
 
@@ -475,7 +474,7 @@
 Object* NewSpace::AllocateRawInternal(int size_in_bytes,
                                       AllocationInfo* alloc_info) {
   Address new_top = alloc_info->top + size_in_bytes;
-  if (new_top > alloc_info->limit) return Failure::RetryAfterGC(size_in_bytes);
+  if (new_top > alloc_info->limit) return Failure::RetryAfterGC();
 
   Object* obj = HeapObject::FromAddress(alloc_info->top);
   alloc_info->top = new_top;