diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 0646719c4c8..c7614e1c435 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -40,7 +40,7 @@ module Gem
   end
 end
 
-if File.expand_path(__FILE__) =~ %r{([^\w/\.-])}
+if File.expand_path(__FILE__) =~ %r{([^\w/\.:\-])}
   abort "The bundler specs cannot be run from a path that contains special characters (particularly #{$1.inspect})"
 end