diff --git a/wp-includes/l10n.php b/wp-includes/l10n.php
index 4f3ec8bfed..1923c8c2a2 100644
--- a/wp-includes/l10n.php
+++ b/wp-includes/l10n.php
@@ -821,7 +821,7 @@ function load_textdomain( $domain, $mofile, $locale = null ) {
 	if ( 'mo' !== $preferred_format ) {
 		array_unshift(
 			$translation_files,
-			substr_replace( $mofile, '.l10n.', - strlen( $preferred_format ) )
+			substr_replace( $mofile, ".l10n.$preferred_format", - strlen( $preferred_format ) )
 		);
 	}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 20687651cb..10606651d3 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-alpha-57337';
+$wp_version = '6.5-alpha-57338';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.