diff --git a/ChangeLog b/ChangeLog
index f1cfe69220..cad0780166 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Apr 25 01:18:43 2005  Tanaka Akira  <akr@m17n.org>
+
+	* regex.c: declare rb_warn to have variadic argument.  [ruby-core:4751]
+
 Sat Apr 23 19:45:59 2005  Hirokazu Yamamoto  <ocean@m2.ccsnet.ne.jp>
 
 	* ext/tcltklib/tcltklib.c (ip_RubyExitCommand): exit with status code
diff --git a/regex.c b/regex.c
index 9e64af57d1..1a53739327 100644
--- a/regex.c
+++ b/regex.c
@@ -185,7 +185,7 @@ static int current_mbctype = MBCTYPE_ASCII;
 
 #ifdef RUBY
 #include "util.h"
-void rb_warn _((char*));
+void rb_warn _((const char*, ...));
 # define re_warning(x) rb_warn(x)
 #endif