diff --git a/ChangeLog b/ChangeLog
index 7eb65c4278..be03ecfab7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Jan 11 21:28:28 2016  Martin Duerst  <duerst@it.aoyama.ac.jp>
+
+	* include/ruby/oniguruma.h: Added flags needed for upcase/downcase
+	  Unicode addition (with Kimihito Matsui)
+
 Mon Jan 11 09:50:24 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* configure.in: check if the API version number is consistent with
diff --git a/include/ruby/oniguruma.h b/include/ruby/oniguruma.h
index 519c0ac336..0d46f306f5 100644
--- a/include/ruby/oniguruma.h
+++ b/include/ruby/oniguruma.h
@@ -122,7 +122,15 @@ ONIG_EXTERN OnigCaseFoldType OnigDefaultCaseFoldFlag;
 
 /* #define ONIGENC_CASE_FOLD_HIRAGANA_KATAKANA  (1<<1) */
 /* #define ONIGENC_CASE_FOLD_KATAKANA_WIDTH     (1<<2) */
+#define ONIGENC_CASE_TITLECASE                  (1<<10)
+#define ONIGENC_CASE_UPCASE                     (1<<11)
+#define ONIGENC_CASE_DOWNCASE                   (1<<12)
+#define ONIGENC_CASE_FOLD                       (1<<13)
+#define ONIGENC_CASE_ONCEONLY                   (1<<14)
+#define ONIGENC_CASE_MODIFIED                   (1<<15)
+#define ONIGENC_CASE_ASCII_ONLY                 (1<<19)
 #define ONIGENC_CASE_FOLD_TURKISH_AZERI         (1<<20)
+#define ONIGENC_CASE_FOLD_LITHUANIAN            (1<<21)
 #define INTERNAL_ONIGENC_CASE_FOLD_MULTI_CHAR   (1<<30)
 
 #define ONIGENC_CASE_FOLD_MIN      INTERNAL_ONIGENC_CASE_FOLD_MULTI_CHAR