diff --git a/templates/default/sinatra.yml.erb b/templates/default/sinatra.yml.erb
index 737c5f8..c41126a 100644
--- a/templates/default/sinatra.yml.erb
+++ b/templates/default/sinatra.yml.erb
@@ -16,5 +16,6 @@ runtimes:
       default: <%= runtime == default_runtime %>
 <%- end %>
 detection:
-  - "*.rb": "\\s*require[\\s\\(]*['\"]sinatra(/base)?['\"]" # .rb files in the root dir containing a require?
+  - "*.rb": "require\\s+'sinatra'|require\\s+\"sinatra\"" # .rb files in the root dir containing a require?
+  - "config.ru": false # use rack if it detects a config.ru
   - "config/environment.rb": false # and config/environment.rb must not exist