diff --git a/library/Businessprocess/Node.php b/library/Businessprocess/Node.php
index 3652454..6223983 100644
--- a/library/Businessprocess/Node.php
+++ b/library/Businessprocess/Node.php
@@ -129,7 +129,7 @@ abstract class Node
 
     public function hasMissingChildren()
     {
-        return count($this->getMissingChildren() > 0);
+        return count($this->getMissingChildren()) > 0;
     }
 
     public function getMissingChildren()