diff --git a/src/Adapter/Zend.php b/src/Adapter/Zend.php
index 5968243..8718480 100644
--- a/src/Adapter/Zend.php
+++ b/src/Adapter/Zend.php
@@ -193,7 +193,7 @@ public function getDependents($parentClass, $ids, $dependentClass, $where = [],
         }
 
         // If only one ID was asked for, return just that group instead of a size-one array of groups
-        return count($ids) > 1 ? $entities : $returnableEntities;
+        return count((array) $ids) > 1 ? $entities : $returnableEntities;
     }
 
     public function addDependent(Entity_Abstract $parent, Entity_Abstract $dependent) {