diff --git a/library/Director/Objects/IcingaCommandArgument.php b/library/Director/Objects/IcingaCommandArgument.php
index e5caa059..925fe318 100644
--- a/library/Director/Objects/IcingaCommandArgument.php
+++ b/library/Director/Objects/IcingaCommandArgument.php
@@ -161,7 +161,8 @@ class IcingaCommandArgument extends IcingaObject
         $resolved = false,
         $skipDefaults = false,
         array $chosenProperties = null,
-        $resolveIds = true
+        $resolveIds = true,
+        $keepId = false
     ) {
         if ($resolved) {
             throw new RuntimeException(
@@ -175,6 +176,12 @@ class IcingaCommandArgument extends IcingaObject
             );
         }
 
+        if ($keepId) {
+            throw new RuntimeException(
+                'IcingaCommandArgument does not support $keepId'
+            );
+        }
+
         // $resolveIds is misused here
         if ($resolveIds) {
             return $this->toCompatPlainObject();