diff --git a/ChangeLog b/ChangeLog
index 49d0cb3e35..e06b514092 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Sep 17 23:25:04 2005  sheepman  <sheepman@sheepman.sakura.ne.jp>
+
+	* lib/mathn.rb (Rational::inspect): should preserve original
+	  operand.  [ruby-core:05806]
+
 Sat Sep 17 23:20:27 2005  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* lib/cgi.rb (CGI::Cookie): should handle multiple values for a
diff --git a/lib/mathn.rb b/lib/mathn.rb
index 2257a4074a..14e2e9272c 100644
--- a/lib/mathn.rb
+++ b/lib/mathn.rb
@@ -124,6 +124,7 @@ class Rational
 
   def ** (other)
     if other.kind_of?(Rational)
+      other2 = other
       if self < 0
 	return Complex.new!(self, 0) ** other
       elsif other == 0
@@ -144,7 +145,7 @@ class Rational
       for elm in npd
 	elm[1] = elm[1] * other
 	if !elm[1].kind_of?(Integer) and elm[1].denominator != 1
-	  return Float(self) ** other
+         return Float(self) ** other2
 	end
 	elm[1] = elm[1].to_i
       end
@@ -152,7 +153,7 @@ class Rational
       for elm in dpd
 	elm[1] = elm[1] * other
 	if !elm[1].kind_of?(Integer) and elm[1].denominator != 1
-	  return Float(self) ** other
+         return Float(self) ** other2
 	end
 	elm[1] = elm[1].to_i
       end