diff --git a/ChangeLog b/ChangeLog
index e4d087dd76..d16c96ccc5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Sep  5 20:07:37 2008  Tanaka Akira  <akr@fsij.org>
+
+	* include/ruby/io.h (rb_io_mode_modenum): moved from
+	  include/ruby/intern.h.
+
 Fri Sep  5 19:59:26 2008  Tanaka Akira  <akr@fsij.org>
 
 	* io.c (MODENUM_MAX): removed.
diff --git a/include/ruby/intern.h b/include/ruby/intern.h
index a2010bb327..105ca62bde 100644
--- a/include/ruby/intern.h
+++ b/include/ruby/intern.h
@@ -391,7 +391,6 @@ VALUE rb_file_open_str(VALUE, const char*);
 VALUE rb_gets(void);
 void rb_write_error(const char*);
 void rb_write_error2(const char*, long);
-int rb_io_mode_modenum(const char *mode);
 void rb_close_before_exec(int lowfd, int maxhint, VALUE noclose_fds);
 int rb_pipe(int *pipes);
 /* marshal.c */
diff --git a/include/ruby/io.h b/include/ruby/io.h
index 8d82338e0b..610d3657e1 100644
--- a/include/ruby/io.h
+++ b/include/ruby/io.h
@@ -140,6 +140,7 @@ FILE *rb_io_stdio_file(rb_io_t *fptr);
 FILE *rb_fdopen(int, const char*);
 int  rb_io_mode_flags(const char*);
 int  rb_io_modenum_flags(int);
+int rb_io_mode_modenum(const char *mode);
 void rb_io_check_writable(rb_io_t*);
 void rb_io_check_readable(rb_io_t*);
 int rb_io_fptr_finalize(rb_io_t*);