diff --git a/forms/GroupedDropdownField.php b/forms/GroupedDropdownField.php
index 352fac4f5..0ba6f03e8 100644
--- a/forms/GroupedDropdownField.php
+++ b/forms/GroupedDropdownField.php
@@ -88,5 +88,12 @@ class GroupedDropdownField extends DropdownField {
 		return 'groupeddropdown dropdown';
 	}
 
+	/**
+	 * @todo Implement DropdownField::validate() with group validation support
+	 */
+	public function validate(Validator $validator) {
+		return true;
+	}
+
 }