diff --git a/wp-admin/includes/upgrade.php b/wp-admin/includes/upgrade.php
index 5692e36e81..6959a4d1b3 100644
--- a/wp-admin/includes/upgrade.php
+++ b/wp-admin/includes/upgrade.php
@@ -3339,6 +3339,7 @@ function make_site_theme_from_default( $theme_name, $template ) {
 			foreach ( $headers as $header => $value ) {
 				if ( strpos( $line, $header ) !== false ) {
 					$line = $header . ' ' . $value;
+					break;
 				}
 			}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index c874179153..081c28ffb6 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-55697';
+$wp_version = '6.3-alpha-55698';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.