diff --git a/wp-includes/version.php b/wp-includes/version.php
index ffb00a3038..9ee46e5db0 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1-alpha-53669';
+$wp_version = '6.1-alpha-53670';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
diff --git a/wp-includes/wp-db.php b/wp-includes/wp-db.php
index 6df284e0aa..d61fc4f0a6 100644
--- a/wp-includes/wp-db.php
+++ b/wp-includes/wp-db.php
@@ -2077,6 +2077,9 @@ class wpdb {
 			}
 		}
 
+		// MySQLi port cannot be a string; must be null or an integer.
+		$port = $port ? absint( $port ) : null;
+
 		return array( $host, $port, $socket, $is_ipv6 );
 	}