diff --git a/src/MD_STD_SEC.php b/src/MD_STD_SEC.php
index e124b70..a4bce73 100644
--- a/src/MD_STD_SEC.php
+++ b/src/MD_STD_SEC.php
@@ -136,7 +136,7 @@ final class MD_STD_SEC {
      */
     public static function sendContentSecurityPolicy(array $directives, string $frame_ancestors = ""):void {
 
-        $policy = 'Content-Security-Policy: default-src ' . $directives['default-src'] . '; connect-src ' . $directives['connect-src'] . '; script-src ' . $directives['script-src'] . '; img-src ' . $directives['img-src'] . '; media-src ' . $directives['media-src'] . '; style-src ' . $directives['style-src'] . '; font-src \'self\'; frame-src ' . $directives['frame-src'] . '; object-src ' . $directives['object-src'] . '; base-uri ' . $directives['base-uri'] . '; form-action ' . $directives['form-action'] . '; manifest-src \'self\';';
+        $policy = 'Content-Security-Policy: default-src ' . $directives['default-src'] . '; connect-src ' . $directives['connect-src'] . '; script-src ' . $directives['script-src'] . '; img-src ' . $directives['img-src'] . '; media-src ' . $directives['media-src'] . '; style-src ' . $directives['style-src'] . '; font-src \'self\'; frame-src ' . $directives['frame-src'] . '; object-src ' . $directives['object-src'] . '; base-uri ' . $directives['base-uri'] . '; form-action ' . $directives['form-action'] . '; manifest-src \'self\'; worker-src \'self\';';
 
         if (!empty($frame_ancestors)) {
             $policy .= ' frame-ancestors ' . $frame_ancestors . ';';