diff --git a/ChangeLog b/ChangeLog
index 7f43f3fd40..f7b8580ce8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Jul 10 17:41:54 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* dir.c (is_case_sensitive): get attributes by the file descriptor
+	  of open directory, instead of using mount point name.
+
 Fri Jul 10 10:46:02 2015  ksss  <co000ri@gmail.com>
 
 	* ext/stringio/stringio.c (writable): remove unnecessary check for
diff --git a/dir.c b/dir.c
index 9b62cb3e07..b75e6d63c5 100644
--- a/dir.c
+++ b/dir.c
@@ -1451,10 +1451,8 @@ is_case_sensitive(DIR *dirp)
     const vol_capabilities_attr_t *const cap = attrbuf[0].cap;
     const int idx = VOL_CAPABILITIES_FORMAT;
     const uint32_t mask = VOL_CAP_FMT_CASE_SENSITIVE;
-    struct statfs sf;
 
-    if (fstatfs(dirfd(dirp), &sf)) return -1;
-    if (getattrlist(sf.f_mntonname, &al, attrbuf, sizeof(attrbuf), FSOPT_NOFOLLOW))
+    if (fgetattrlist(dirfd(dirp), &al, attrbuf, sizeof(attrbuf), FSOPT_NOFOLLOW))
 	return -1;
     if (!(cap->valid[idx] & mask))
 	return -1;