diff --git a/apps/client/index.html b/apps/client/index.html
index c6a234f367..88135e8ca2 100644
--- a/apps/client/index.html
+++ b/apps/client/index.html
@@ -6,6 +6,7 @@
   <meta name='viewport' content='width=device-width, initial-scale=1' />
   <meta name='theme-color' content='#121212' />
   <meta name='ontime' content='ontime - event timer manager' />
+  <meta http-equiv="Content-Security-Policy" content="fullscreen 'self';">
   <link rel='apple-touch-icon' href='/logo192.png' />
   <link
     rel='icon'