diff --git a/Casks/multifirefox.rb b/Casks/multifirefox.rb
index e11510510..1b3612c57 100644
--- a/Casks/multifirefox.rb
+++ b/Casks/multifirefox.rb
@@ -1,5 +1,5 @@
 class Multifirefox < Cask
-  url 'http://mff.s3.amazonaws.com/MFF2_latest.dmg'
+  url 'https://mff.s3.amazonaws.com/MFF2_latest.dmg'
   appcast 'https://s3.amazonaws.com/mff_sparkle/MultiFirefoxAppcast2.xml'
   homepage 'http://davemartorana.com/multifirefox'
   version 'latest'