diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-controller.php
index 1b73881e96..dbd129cc43 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-controller.php
@@ -385,12 +385,18 @@ abstract class WP_REST_Controller {
 
 		$additional_fields = $this->get_additional_fields();
 
+		$requested_fields = $this->get_fields_for_response( $request );
+
 		foreach ( $additional_fields as $field_name => $field_options ) {
 
 			if ( ! $field_options['get_callback'] ) {
 				continue;
 			}
 
+			if ( ! in_array( $field_name, $requested_fields, true ) ) {
+				continue;
+			}
+
 			$object[ $field_name ] = call_user_func( $field_options['get_callback'], $object, $field_name, $request, $this->get_object_type() );
 		}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 0f5082bc6f..6707a3cb06 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-alpha-43985';
+$wp_version = '5.1-alpha-43986';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.