diff --git a/fs/nilfs2/dir.c b/fs/nilfs2/dir.c
index bc846b904b68..aee40db7a036 100644
--- a/fs/nilfs2/dir.c
+++ b/fs/nilfs2/dir.c
@@ -240,7 +240,7 @@ nilfs_filetype_table[NILFS_FT_MAX] = {
 
 #define S_SHIFT 12
 static unsigned char
-nilfs_type_by_mode[S_IFMT >> S_SHIFT] = {
+nilfs_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
        [S_IFREG >> S_SHIFT]    = NILFS_FT_REG_FILE,
        [S_IFDIR >> S_SHIFT]    = NILFS_FT_DIR,
        [S_IFCHR >> S_SHIFT]    = NILFS_FT_CHRDEV,