diff --git a/templates/prometheus.yml.erb b/templates/prometheus.yml.erb
index 2fec727..be3e5a8 100644
--- a/templates/prometheus.yml.erb
+++ b/templates/prometheus.yml.erb
@@ -1,5 +1,6 @@
 <% require 'yaml' -%>
-<%= if @configuration
+<% configuration = scope.lookupvar('::prometheus::configuration') -%>
+<%= if configuration
 configuration.to_yaml().gsub(/source_labels: ".+?"/) { |x| x.gsub('"', '') }
 end
  -%>