diff --git a/ChangeLog b/ChangeLog
index 16e54a4b1b..bd0cc12ec9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Mon May 23 09:45:26 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
+
+	* include/ruby/defines.h (CASEFOLD_FILESYSTEM): Revert r30508. Forgot to
+	  include this file in the commit r31692. __APPLE__ is not
+	  CASEFOLD_FILESYSTEM again, from this time.
+
 Mon May 23 10:01:02 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
 
 	* ext/openssl/ossl_asn1.c: Do not parse zero-tagged values as EOC. Do
diff --git a/include/ruby/defines.h b/include/ruby/defines.h
index 2ae5bef568..02ea2e0856 100644
--- a/include/ruby/defines.h
+++ b/include/ruby/defines.h
@@ -321,7 +321,7 @@ void rb_ia64_flushrs(void);
 #endif
 
 #ifndef CASEFOLD_FILESYSTEM
-# if defined DOSISH || defined __APPLE__
+# if defined DOSISH
 #   define CASEFOLD_FILESYSTEM 1
 # else
 #   define CASEFOLD_FILESYSTEM 0