diff --git a/mm/sparse.c b/mm/sparse.c
index 3570ff294ab1..f13f2723950a 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -522,7 +522,7 @@ static void __init alloc_usemap_and_memmap(void (*alloc_func)
 		map_count = 1;
 	}
 	/* ok, last chunk */
-	alloc_func(data, pnum_begin, NR_MEM_SECTIONS,
+	alloc_func(data, pnum_begin, __highest_present_section_nr+1,
 						map_count, nodeid_begin);
 }