diff --git a/Formula/classads.rb b/Formula/classads.rb
index eecd9eddfb..a709e0160b 100644
--- a/Formula/classads.rb
+++ b/Formula/classads.rb
@@ -1,7 +1,7 @@
 class Classads < Formula
   desc "Classified Advertisements (used by HTCondor Central Manager)"
   homepage "https://research.cs.wisc.edu/htcondor/classad/"
-  url "ftp://ftp.cs.wisc.edu/condor/classad/c++/classads-1.0.10.tar.gz"
+  url "http://ftp.cs.wisc.edu/condor/classad/c++/classads-1.0.10.tar.gz"
   sha256 "cde2fe23962abb6bc99d8fc5a5cbf88f87e449b63c6bca991d783afb4691efb3"
 
   bottle do