diff --git a/Library/Homebrew/cmd/info.rb b/Library/Homebrew/cmd/info.rb
index 02cacff1d9..96152a5c89 100644
--- a/Library/Homebrew/cmd/info.rb
+++ b/Library/Homebrew/cmd/info.rb
@@ -21,7 +21,7 @@ module Homebrew extend self
   end
 
   def github_fork
-    if which 'git'
+    if which 'git' and (HOMEBREW_REPOSITORY/".git").directory?
       if `git remote -v` =~ %r{origin\s+(https?://|git(?:@|://))github.com[:/](.+)/homebrew}
         $2
       end