diff --git a/manifests/nginx_prometheus_exporter.pp b/manifests/nginx_prometheus_exporter.pp
index 695dd4819..81ff8d61f 100644
--- a/manifests/nginx_prometheus_exporter.pp
+++ b/manifests/nginx_prometheus_exporter.pp
@@ -97,7 +97,7 @@
     default => undef,
   }
 
-  $options = "-nginx.scrape-uri '${scrape_uri}' ${extra_options}"
+  $options = "--nginx.scrape-uri '${scrape_uri}' ${extra_options}"
 
   if $install_method == 'url' {
     # Not a big fan of copypasting but prometheus::daemon takes for granted