diff --git a/block/partitions/core.c b/block/partitions/core.c
index 58034dd2d215..269c86523e67 100644
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -712,8 +712,7 @@ void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p)
 		goto out;
 	}
 
-	page = read_mapping_page(mapping,
-			(pgoff_t)(n >> (PAGE_SHIFT - 9)), NULL);
+	page = read_mapping_page(mapping, n >> PAGE_SECTORS_SHIFT, NULL);
 	if (IS_ERR(page))
 		goto out;