diff --git a/mm/shmem.c b/mm/shmem.c
index ce64b6616376..7be94342bf06 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2012,7 +2012,7 @@ static int shmem_parse_options(char *options, int *mode, uid_t *uid,
 			}
 			if (*rest)
 				goto bad_val;
-			*blocks = size >> PAGE_CACHE_SHIFT;
+			*blocks = DIV_ROUND_UP(size, PAGE_CACHE_SIZE);
 		} else if (!strcmp(this_char,"nr_blocks")) {
 			*blocks = memparse(value,&rest);
 			if (*rest)