Suppress more -Wparentheses warnings

[Fix GH-1958]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64808 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/dir.c b/dir.c
index 2c1116eea9..c8aa40099b 100644
--- a/dir.c
+++ b/dir.c
@@ -177,7 +177,7 @@ has_nonascii(const char *ptr, size_t len)
 #endif
 
 #ifndef IFTODT
-# define IFTODT(m)	(((m) & S_IFMT) / ((~S_IFMT & S_IFMT-1) + 1))
+# define IFTODT(m)	(((m) & S_IFMT) / ((~S_IFMT & (S_IFMT-1)) + 1))
 #endif
 
 typedef enum {