diff --git a/includes/core/class-validation.php b/includes/core/class-validation.php
index ae0f38b5..9645bfbb 100644
--- a/includes/core/class-validation.php
+++ b/includes/core/class-validation.php
@@ -95,6 +95,7 @@ if ( ! class_exists( 'um\core\Validation' ) ) {
 					! empty( $fields[ $key ]['custom_dropdown_options_source'] ) &&
 					function_exists( $fields[ $key ]['custom_dropdown_options_source'] ) ){
 					$arr_options = call_user_func( $fields[ $key ]['custom_dropdown_options_source'] );
+					$fields[ $key ]['options'] = array_keys( $arr_options );
 				}
 				
 				// Unset changed value that doesn't match the option list