diff --git a/custom/lib/facter/environment.rb b/custom/lib/facter/environment.rb
index 45a3f76..77ef58d 100644
--- a/custom/lib/facter/environment.rb
+++ b/custom/lib/facter/environment.rb
@@ -1,5 +1,5 @@
 ENV.each do |k,v|
-    next if not k.downcase.start_with?("puppet_")
+    next if not k.downcase =~ /^puppet_/
     Facter.add("env_#{k.downcase}".to_sym) do
         setcode do
             v