From 28861ac92d910abbe014a05c4418ee077371d9ca Mon Sep 17 00:00:00 2001
From: Xu Cheng
Date: Thu, 14 Jul 2016 13:14:49 +0800
Subject: CurlDownloadStrategy#_fetch: fix unintended variable modification

---
 Library/Homebrew/download_strategy.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'Library')

diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index 4fa0b3803..061e551a6 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -333,7 +333,7 @@ class CurlDownloadStrategy < AbstractFileDownloadStrategy
     url = @url
 
     if ENV["HOMEBREW_ARTIFACT_DOMAIN"]
-      url.sub!(%r{^((ht|f)tps?://)?}, ENV["HOMEBREW_ARTIFACT_DOMAIN"].chomp("/") + "/")
+      url = url.sub(%r{^((ht|f)tps?://)?}, ENV["HOMEBREW_ARTIFACT_DOMAIN"].chomp("/") + "/")
       ohai "Downloading from #{url}"
     end
 
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