diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index 17ee4143f9..bf1b1b1de5 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -144,6 +144,11 @@ class CurlDownloadStrategy < AbstractDownloadStrategy
 
   private
 
+  def curl(*args)
+    args << '--connect-timeout' << '5' unless @mirrors.empty?
+    super
+  end
+
   def xzpath
     "#{HOMEBREW_PREFIX}/opt/xz/bin/xz"
   end