diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index 78dc4cf4e7..4b3cfc38ab 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -494,7 +494,7 @@ class Tap
 
   # an array of all installed {Tap} names.
   def self.names
-    map(&:name)
+    map(&:name).sort
   end
 
   # @private