diff --git a/vm/vm-region.c b/vm/vm-region.c
index b4ac9e6..0f135ac 100644
--- a/vm/vm-region.c
+++ b/vm/vm-region.c
@@ -545,8 +545,8 @@ static void vm_iterator_begin(
 		buffer_size += vm_page_get_size_bytes(next);
 	}
 
-	it->it_buf = buffer_base;
-	it->it_max = buffer_size;
+	it->it_buf = (char *)buffer_base + (object_offset & VM_PAGE_MASK);
+	it->it_max = buffer_size - (object_offset & VM_PAGE_MASK);
 }
 
 static kern_status_t vm_iterator_seek(struct vm_iterator *it, size_t nr_bytes)
@@ -615,7 +615,7 @@ static kern_status_t vm_iterator_seek(struct vm_iterator *it, size_t nr_bytes)
 		buffer_size += vm_page_get_size_bytes(next);
 	}
 
-	it->it_buf = buffer_base;
+	it->it_buf = (char *)buffer_base + (object_offset & VM_PAGE_MASK);
 	it->it_max = buffer_size;
 	return KERN_OK;
 }