diff --git a/manifests/params.pp b/manifests/params.pp
index 5eb9ea59..2e477f66 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -5,6 +5,7 @@
   $version           = '1.1.0'
   $manage_modulepath = false
   $install_options   = ''
+  $sources           = undef
 
   # r10k configuration
   $r10k_config_file = '/etc/r10k.yaml'