diff --git a/mm/sparse.c b/mm/sparse.c
index 158d6a2..ac26eb0 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -36,7 +36,7 @@
 static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
 #endif
 
-unsigned long page_to_nid(struct page *page)
+int page_to_nid(struct page *page)
 {
 	return section_to_node_table[page_to_section(page)];
 }