diff --git a/support/spec/spec_helper.rb b/support/spec/spec_helper.rb
index a0064e2..c265b93 100644
--- a/support/spec/spec_helper.rb
+++ b/support/spec/spec_helper.rb
@@ -1,7 +1,7 @@
 require 'rubygems'
 require 'rspec/core'
 
-ENV['TM_SUPPORT_PATH'] = '/Applications/TextMate.app/Contents/SharedSupport/Support'
+ENV['TM_SUPPORT_PATH'] = '/Applications/TextMate.app/Contents/SharedSupport/Support' unless ENV.has_key?('TM_SUPPORT_PATH')
 
 RSpec.configure do |c|
   c.include(Module.new do
@@ -9,4 +9,4 @@ def project_root
       @project_root ||= File.expand_path(File.join(File.dirname(__FILE__), '../fixtures'))
     end
   end)
-end
\ No newline at end of file
+end