diff --git a/lib/cucumber/rb_support/rb_transform.rb b/lib/cucumber/rb_support/rb_transform.rb
index a8e961cb10..d6d4fc26ff 100644
--- a/lib/cucumber/rb_support/rb_transform.rb
+++ b/lib/cucumber/rb_support/rb_transform.rb
@@ -34,11 +34,14 @@ def invoke(arg)
       end
     
       def to_s
-        strip_captures(strip_anchors(@regexp.source))
+         convert_captures(strip_anchors(@regexp.source))
       end
     
     private
-
+      def convert_captures(regexp_source)
+        regexp_source.gsub(/(\()(?!\?:)/,'(?:')
+      end
+      
       def strip_captures(regexp_source)
         regexp_source.
           gsub(/(\()/, '').
diff --git a/spec/cucumber/rb_support/rb_transform_spec.rb b/spec/cucumber/rb_support/rb_transform_spec.rb
index b0888ce9b7..fa3077bfbc 100644
--- a/spec/cucumber/rb_support/rb_transform_spec.rb
+++ b/spec/cucumber/rb_support/rb_transform_spec.rb
@@ -8,8 +8,12 @@ def transform(regexp)
         RbTransform.new(nil, regexp, lambda { |a| })
       end
       describe "#to_s" do
-        it "removes the capture group parentheses" do
-          transform(/(a)bc/).to_s.should == "abc"
+        it "converts captures groups to non-capture groups" do
+          transform(/(a|b)bc/).to_s.should == "(?:a|b)bc"
+        end
+        
+        it "leaves non capture groups alone" do
+          transform(/(?:a|b)bc/).to_s.should == "(?:a|b)bc"
         end
         
         it "strips away anchors" do