diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index 17319c7f46..9373036210 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -1548,11 +1548,11 @@ function nocache_headers() {
  * @since 2.1.0
  */
 function cache_javascript_headers() {
-	$expiresOffset = 10 * DAY_IN_SECONDS;
+	$expires_offset = 10 * DAY_IN_SECONDS;
 
 	header( 'Content-Type: text/javascript; charset=' . get_bloginfo( 'charset' ) );
 	header( 'Vary: Accept-Encoding' ); // Handle proxies.
-	header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + $expiresOffset ) . ' GMT' );
+	header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + $expires_offset ) . ' GMT' );
 }
 
 /**