diff --git a/www/constants.inc b/www/constants.inc
index 0df3c085ca..b6a355c4b8 100644
--- a/www/constants.inc
+++ b/www/constants.inc
@@ -13,21 +13,22 @@ define('SETTINGS_PATH', realpath(WWW_PATH . '/settings/'));
 define('TEMP_DIR', realpath(WWW_PATH . '/tmp/'));
 define('OE_PATH', realpath(WWW_PATH . '/experiments/'));
 
+define('WPT_SALT', '2502');  // used to force assets hash
 define('VER_WEBPAGETEST', '21.07');   // webpagetest version
-define('VER_TYPOGRAPHY_CSS', @md5_file(ASSETS_PATH . '/css/typography.css'));          // version of the typography css file
-define('VER_LAYOUT_CSS', @md5_file(ASSETS_PATH . '/css/layout.css'));          // version of the layout css file
-define('VER_CSS', @md5_file(ASSETS_PATH . '/css/pagestyle2.css'));          // version of the sitewide css file
-define('VER_HEADER_CSS', @md5_file(ASSETS_PATH . '/css/wpt-header.css')); // version of the header css file
-define('VER_ACCOUNT_CSS', @md5_file(ASSETS_PATH . '/css/account.css')); // version of the account css file
-define('VER_PRICE_CHANGER_JS', @md5_file(ASSETS_PATH . '/js/signup-price-changer.js'));
-define('VER_FAQ_JS', @md5_file(ASSETS_PATH . '/js/accessible-faq.js'));
-define('VER_BUTTON_CSS', @md5_file(ASSETS_PATH . '/css/button.css'));   // version of the button css file
-define('VER_JS', @md5_file(ASSETS_PATH . '/js/site.js'));                 // version of the sitewide javascript file
-define('VER_JS_TEST', @md5_file(ASSETS_PATH . '/js/test.js'));            // version of the javascript specific to the test pages
-define('VER_JS_RUNNING', @md5_file(ASSETS_PATH . '/js/running.js'));          // version of the javascript specific to the test running status page
-define('VER_JS_ACCOUNT', @md5_file(ASSETS_PATH . '/js/account.js'));          // version of the javascript specific to the test running status page
-define('VER_JS_ESTIMATE_TAXES', @md5_file(ASSETS_PATH . '/js/estimate-taxes.js'));
-define('VER_JS_COUNTRY_LIST', @md5_file(ASSETS_PATH . '/js/country-list/country-list.js'));
+define('VER_TYPOGRAPHY_CSS', @md5_file(ASSETS_PATH . '/css/typography.css') . WPT_SALT);          // version of the typography css file
+define('VER_LAYOUT_CSS', @md5_file(ASSETS_PATH . '/css/layout.css') . WPT_SALT);          // version of the layout css file
+define('VER_CSS', @md5_file(ASSETS_PATH . '/css/pagestyle2.css') . WPT_SALT);          // version of the sitewide css file
+define('VER_HEADER_CSS', @md5_file(ASSETS_PATH . '/css/wpt-header.css') . WPT_SALT); // version of the header css file
+define('VER_ACCOUNT_CSS', @md5_file(ASSETS_PATH . '/css/account.css') . WPT_SALT); // version of the account css file
+define('VER_PRICE_CHANGER_JS', @md5_file(ASSETS_PATH . '/js/signup-price-changer.js') . WPT_SALT);
+define('VER_FAQ_JS', @md5_file(ASSETS_PATH . '/js/accessible-faq.js') . WPT_SALT);
+define('VER_BUTTON_CSS', @md5_file(ASSETS_PATH . '/css/button.css') . WPT_SALT);   // version of the button css file
+define('VER_JS', @md5_file(ASSETS_PATH . '/js/site.js') . WPT_SALT);                 // version of the sitewide javascript file
+define('VER_JS_TEST', @md5_file(ASSETS_PATH . '/js/test.js') . WPT_SALT);            // version of the javascript specific to the test pages
+define('VER_JS_RUNNING', @md5_file(ASSETS_PATH . '/js/running.js') . WPT_SALT);          // version of the javascript specific to the test running status page
+define('VER_JS_ACCOUNT', @md5_file(ASSETS_PATH . '/js/account.js') . WPT_SALT);          // version of the javascript specific to the test running status page
+define('VER_JS_ESTIMATE_TAXES', @md5_file(ASSETS_PATH . '/js/estimate-taxes.js') . WPT_SALT);
+define('VER_JS_COUNTRY_LIST', @md5_file(ASSETS_PATH . '/js/country-list/country-list.js') . WPT_SALT);
 define('UNKNOWN_TIME', -1);           // Value used as a flag for an unknown time.
 
 define('BREAKDOWN_CACHE_VERSION', 4);