diff --git a/manifests/repo/apt.pp b/manifests/repo/apt.pp
index 50687a1cc..707c619dc 100644
--- a/manifests/repo/apt.pp
+++ b/manifests/repo/apt.pp
@@ -31,7 +31,7 @@
     key_content => $key_content,
   }
 
-  if $pin {
+  if $pin != '' {
     validate_re($pin, '\d\d\d')
     apt::pin { 'rabbitmq':
       packages => 'rabbitmq-server',