diff --git a/html/inc/cache.inc b/html/inc/cache.inc
index 5653993d55..a60377f21f 100644
--- a/html/inc/cache.inc
+++ b/html/inc/cache.inc
@@ -23,7 +23,7 @@ function start_cache($max_age, $params=""){
        ob_implicit_flush(0);
        Header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
        Header("Expires: " . gmdate("D, d M Y H:i:s",time()+$max_age) . " GMT");
-       Header("Cache-Control: public, max-age=" . $max_age . ", must-revalidate");
+       Header("Cache-Control: public, max-age=" . $max_age); 
    } else {
        // Otherwise serve the cached version and exit
        //
@@ -32,7 +32,7 @@ function start_cache($max_age, $params=""){
        }
        Header("Last-Modified: " . gmdate("D, d M Y H:i:s",@filemtime($path)) . " GMT");
        Header("Expires: " . gmdate("D, d M Y H:i:s",@filemtime($path)+$max_age) . " GMT");
-       Header("Cache-Control: public, max-age=" . $max_age . ", must-revalidate");
+       Header("Cache-Control: public, max-age=" . $max_age );
        readfile($path);
        exit;
    }