diff --git a/src/wp-includes/load.php b/src/wp-includes/load.php
index 44b4ed255f..2f2d95b300 100644
--- a/src/wp-includes/load.php
+++ b/src/wp-includes/load.php
@@ -279,7 +279,7 @@ function timer_stop( $display = 0, $precision = 3 ) {
  * When `WP_DEBUG_LOG` is true, errors will be logged to debug.log in the content
  * directory.
  *
- * Errors are never displayed for XML-RPC requests.
+ * Errors are never displayed for XML-RPC, REST, and Ajax requests.
  *
  * @since 3.0.0
  * @access private
@@ -300,7 +300,8 @@ function wp_debug_mode() {
 	} else {
 		error_reporting( E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR );
 	}
-	if ( defined( 'XMLRPC_REQUEST' ) || defined( 'REST_REQUEST' ) ) {
+
+	if ( defined( 'XMLRPC_REQUEST' ) || defined( 'REST_REQUEST' ) || ( defined( 'DOING_AJAX' ) && DOING_AJAX ) ) {
 		ini_set( 'display_errors', 0 );
 	}
 }