diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 3f2653e4ab..bfaa41ad34 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -778,6 +778,14 @@ class Formula
     HOMEBREW_PREFIX+"var"
   end
 
+  # The directory where the formula's ZSH function files should be
+  # installed.
+  # This is symlinked into `HOMEBREW_PREFIX` after installation or with
+  # `brew link` for formulae that are not keg-only.
+  def zsh_function
+    share+"zsh/site-functions"
+  end
+
   # The directory where the formula's fish function files should be
   # installed.
   # This is symlinked into `HOMEBREW_PREFIX` after installation or with