diff --git a/mm/filemap.c b/mm/filemap.c
index 2e9bcc2e7977b6fa2975fe282bd1bab4208f1bf9..6846a902f5cfa062507d1163b95d50c1dfe8b546 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1471,7 +1471,8 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma,
 
 	if (VM_SequentialReadHint(vma) ||
 			offset - 1 == (ra->prev_pos >> PAGE_CACHE_SHIFT)) {
-		page_cache_sync_readahead(mapping, ra, file, offset, 1);
+		page_cache_sync_readahead(mapping, ra, file, offset,
+					  ra->ra_pages);
 		return;
 	}