diff --git a/user.js b/user.js
index 0ef5306..1b8f9fd 100644
--- a/user.js
+++ b/user.js
@@ -26,6 +26,7 @@ user_pref("browser.newtabpage.activity-stream.asrouter.providers.cfr", "");
 user_pref("browser.newtabpage.activity-stream.asrouter.providers.cfr-fxa", "");
 user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.addons", false);
 user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.features", false);
+user_pref("browser.newtabpage.activity-stream.default.sites", "");
 user_pref("browser.newtabpage.activity-stream.discoverystream.config", "{\"collapsible\":true,\"enabled\":false,\"personalized\":false,\"layout_endpoint\":\"\"}");
 user_pref("browser.newtabpage.activity-stream.discoverystream.enabled", false);
 user_pref("browser.newtabpage.activity-stream.discoverystream.endpoints", "");