diff --git a/manifests/job.pp b/manifests/job.pp
index 2de6501..88b03a2 100644
--- a/manifests/job.pp
+++ b/manifests/job.pp
@@ -42,7 +42,7 @@
 
   validate_re($console, '^(log|none|output)$', 'console must be "log", "none", or "output".')
 
-  validate_re($expect, '^(|fork|daemon|stop)$', 'expect must be "fork", "daemon", "stop".')
+  if $expect {validate_re($expect, '^(|fork|daemon|stop)$', 'expect must be "fork", "daemon", "stop".')}
 
   validate_bool($service_enable)
   validate_bool($respawn)