diff --git a/ChangeLog b/ChangeLog
index ac02dd25af..2bd5339e8e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Jul  9 20:01:59 2011  Tadayoshi Funaba  <tadf@dotrb.org>
+
+	* internal.h: rb_rational_reciprocal is defined in rational.c.
+
 Sat Jul  9 19:48:31 2011  Tadayoshi Funaba  <tadf@dotrb.org>
 
 	* internal.h: added declarations.
diff --git a/internal.h b/internal.h
index c495a7576f..a5b9297c04 100644
--- a/internal.h
+++ b/internal.h
@@ -124,7 +124,6 @@ VALUE rb_math_sqrt(VALUE);
 void Init_newline(void);
 
 /* numeric.c */
-VALUE rb_rational_reciprocal(VALUE x);
 int rb_num_to_uint(VALUE val, unsigned int *ret);
 int ruby_float_step(VALUE from, VALUE to, VALUE step, int excl);
 
@@ -140,6 +139,7 @@ VALUE rb_proc_location(VALUE self);
 
 /* rational.c */
 VALUE rb_lcm(VALUE x, VALUE y);
+VALUE rb_rational_reciprocal(VALUE x);
 
 /* re.c */
 VALUE rb_reg_compile(VALUE str, int options, const char *sourcefile, int sourceline);