diff --git a/manifests/params.pp b/manifests/params.pp
index 1a2faf8..46a0da6 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -30,7 +30,7 @@ class acme_vault::params {
     # namecheap
     $namecheap_username = undef
     $namecheap_api_key  = undef
-    $namecheap_sourceip = 127.0.0.1
+    $namecheap_sourceip = '127.0.0.1'
 
     # settings for deploy
     $cert_destination_path = '/etc/acme'