From 6661350bcdd074b6bbc4cf277d65ef5856cb22ac Mon Sep 17 00:00:00 2001
From: Trent Ogren <tedwardo2@gmail.com>
Date: Thu, 8 Aug 2013 13:34:17 -0500
Subject: Don't mutate the object passed into Color#rgb=

---
 lib/axlsx/stylesheet/color.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lib')

diff --git a/lib/axlsx/stylesheet/color.rb b/lib/axlsx/stylesheet/color.rb
index 744e63d5..e736af7f 100644
--- a/lib/axlsx/stylesheet/color.rb
+++ b/lib/axlsx/stylesheet/color.rb
@@ -51,7 +51,7 @@ module Axlsx
     # @see color
     def rgb=(v)
       Axlsx::validate_string(v)
-      v.upcase!
+      v = v.upcase
       v = v * 3 if v.size == 2
       v = v.rjust(8, 'FF')
       raise ArgumentError, "Invalid color rgb value: #{v}." unless v.match(/[0-9A-F]{8}/)
-- 
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