diff --git a/src/Structure.php b/src/Structure.php
index 68570f4..c1de388 100644
--- a/src/Structure.php
+++ b/src/Structure.php
@@ -360,6 +360,10 @@ public static function prepareToStore($value)
             return $value->toArray();
         }
 
+        if ($value instanceof \stdClass) {
+            return $value;   
+        }
+
         // other objects convert to array
         return (array) $value;
     }