diff --git a/ChangeLog b/ChangeLog
index 67b0fbce0c..a4c9f8f220 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Jan 24 18:19:42 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* include/ruby/encoding.h (rb_enc_is_newline): parenthesized arguments.
+
 Thu Jan 24 18:14:14 2008  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* re.c (rb_reg_fixed_encoding_p): no need to treat ASCII-8BIT specially.
diff --git a/include/ruby/encoding.h b/include/ruby/encoding.h
index ca06b4dd7a..76ce8597d7 100644
--- a/include/ruby/encoding.h
+++ b/include/ruby/encoding.h
@@ -134,7 +134,7 @@ int rb_enc_codelen(int code, rb_encoding *enc);
 #define rb_enc_right_char_head(s,p,enc) (char *)onigenc_get_right_adjust_char_head(enc,(UChar*)(s),(UChar*)(p))
 
 /* ptr, ptr, encoding -> newline_or_not */
-#define rb_enc_is_newline(p,end,enc)  ONIGENC_IS_MBC_NEWLINE(enc,(UChar*)p,(UChar*)end)
+#define rb_enc_is_newline(p,end,enc)  ONIGENC_IS_MBC_NEWLINE(enc,(UChar*)(p),(UChar*)(end))
 
 #define rb_enc_isctype(c,t,enc) ONIGENC_IS_CODE_CTYPE(enc,c,t)
 #define rb_enc_isascii(c,enc) ONIGENC_IS_CODE_ASCII(c)