diff --git a/types/servername.pp b/types/servername.pp
index e64f792..45a23db 100644
--- a/types/servername.pp
+++ b/types/servername.pp
@@ -1 +1 @@
-type Barman::ServerName = Pattern[/^[\w]*$/]
+type Barman::ServerName = Pattern[/^[\w-]*$/]