diff --git a/templates/prometheus.yaml.erb b/templates/prometheus.yaml.erb
index a350d5329..62254834d 100644
--- a/templates/prometheus.yaml.erb
+++ b/templates/prometheus.yaml.erb
@@ -11,4 +11,4 @@
     'alertmanagers'=>scope.lookupvar('::prometheus::alertmanagers_config'),
   }
 } -%>
-<%= full_config.to_yaml.gsub(/source_labels: ".+?"/) { |x| x.gsub('"', '') } -%>
+<%= full_config.to_yaml(options = {:line_width => -1}).gsub(/source_labels: ".+?"/) { |x| x.gsub('"', '') } -%>