diff --git a/manifests/resource/upstream.pp b/manifests/resource/upstream.pp
index d3665b2d0..0d5153bb1 100644
--- a/manifests/resource/upstream.pp
+++ b/manifests/resource/upstream.pp
@@ -134,7 +134,7 @@
     }),
   }
 
-  if $members != undef {
+  if ! empty($members) {
     $members.each |$member,$values| {
       $member_values = merge($member_defaults,$values,{'upstream' => $name,'context' => $context})