diff --git a/src/Definition/ArrayAccessDefinitionTrait.php b/src/Definition/ArrayAccessDefinitionTrait.php
index 4221191e7b7385fcbeacb3dc2daf72a89a084dfb..866590455b1e7fab77d8c763b48ab3017d6d4e61 100644
--- a/src/Definition/ArrayAccessDefinitionTrait.php
+++ b/src/Definition/ArrayAccessDefinitionTrait.php
@@ -36,6 +36,7 @@ trait ArrayAccessDefinitionTrait {
    * {@inheritdoc}
    */
   public function offsetUnset($offset) {
+    unset($this->definition[$offset]);
   }
 
 }