diff --git a/PVE/CLI/pveam.pm b/PVE/CLI/pveam.pm
index 10511f24..18f8d94e 100644
--- a/PVE/CLI/pveam.pm
+++ b/PVE/CLI/pveam.pm
@@ -36,6 +36,7 @@ __PACKAGE__->register_method ({
     description => "Update Container Template Database.",
     parameters => {
 	additionalProperties => 0,
+	properties => {},
     },
     returns => { type => 'null'},
     code => sub {