diff --git a/linker/linker_block_allocator.cpp b/linker/linker_block_allocator.cpp
index fdb4c85..1e2f9a2 100644
--- a/linker/linker_block_allocator.cpp
+++ b/linker/linker_block_allocator.cpp
@@ -134,7 +134,7 @@
 
   FreeBlockInfo* first_block = reinterpret_cast<FreeBlockInfo*>(page->bytes);
   first_block->next_block = free_block_list_;
-  first_block->num_free_blocks = (kAllocateSize - sizeof(LinkerBlockAllocatorPage*))/block_size_;
+  first_block->num_free_blocks = sizeof(page->bytes) / block_size_;
 
   free_block_list_ = first_block;