diff --git a/manifests/manage_dropin.pp b/manifests/manage_dropin.pp
index a5f7d0bb..3940c227 100644
--- a/manifests/manage_dropin.pp
+++ b/manifests/manage_dropin.pp
@@ -134,7 +134,7 @@
   }
 
   if $swap_entry and $unit !~ Pattern['^[^/]+\.swap'] {
-    fail("Systemd::Manage_dropin[${name}]: for unit ${unit} mount_entry is only valid for swap units")
+    fail("Systemd::Manage_dropin[${name}]: for unit ${unit} swap_entry is only valid for swap units")
   }
 
   systemd::dropin_file { $name: