diff --git a/Library/Contributions/examples/brew-which.rb b/Library/Contributions/examples/brew-which.rb
index a331e9f452..9e5eb64fb7 100755
--- a/Library/Contributions/examples/brew-which.rb
+++ b/Library/Contributions/examples/brew-which.rb
@@ -3,19 +3,12 @@ require 'extend/pathname'
 REAL_CELLAR = HOMEBREW_CELLAR.realpath
 
 class String
-  def starts_with?(prefix)
+  def starts_with? prefix
     prefix = prefix.to_s
     self[0, prefix.length] == prefix
   end
 end
 
-class Pathname
-  def starts_with?(prefix)
-    prefix = prefix.to_s
-    self.to_s[0, prefix.length] == prefix
-  end
-end
-
 
 def audit
   brew_links = Array.new
diff --git a/Library/Homebrew/extend/pathname.rb b/Library/Homebrew/extend/pathname.rb
index 93a1f08cca..cb06688d7b 100644
--- a/Library/Homebrew/extend/pathname.rb
+++ b/Library/Homebrew/extend/pathname.rb
@@ -203,6 +203,11 @@ class Pathname
   def resolved_path_exists?
     (dirname+readlink).exist?
   end
+
+  def starts_with? prefix
+    prefix = prefix.to_s
+    self.to_s[0, prefix.length] == prefix
+  end
 end
 
 # sets $n and $d so you can observe creation of stuff