diff --git a/Library/Homebrew/cmd/install.rb b/Library/Homebrew/cmd/install.rb
index eafc5fd2c6..7d97b868e1 100644
--- a/Library/Homebrew/cmd/install.rb
+++ b/Library/Homebrew/cmd/install.rb
@@ -94,11 +94,12 @@ module Homebrew
 
         # If they haven't updated in 48 hours (172800 seconds), that
         # might explain the error
-        master = HOMEBREW_REPOSITORY.join(".git", "refs", "heads", "master")
-        if master.exist? && (Time.now.to_i - File.mtime(master).to_i) > 172800
+        master = HOMEBREW_REPOSITORY/".git/refs/heads/master"
+        if master.exist? && (Time.now.to_i - File.mtime(master).to_i) > 1#72800
           ohai "You haven't updated Homebrew in a while."
           puts <<-EOS.undent
-            A formula for #{e.name} might have been added recently: run `brew update` to make sure everything's up-to-date!
+            A formula for #{e.name} might have been added recently.
+            Run `brew update` to get the latest Homebrew updates!
           EOS
         end
       end