diff --git a/src/js/background.js b/src/js/background.js
index 61e984c59..87143a7ff 100644
--- a/src/js/background.js
+++ b/src/js/background.js
@@ -106,7 +106,6 @@ const µBlock = (( ) => { // jshint ignore:line
         cloudStorageSupported: vAPI.cloud instanceof Object,
         canFilterResponseData: typeof browser.webRequest.filterResponseData === 'function',
         canInjectScriptletsNow: vAPI.webextFlavor.soup.has('chromium'),
-        proxyDNS: undefined,
 
         // https://github.com/chrisaljoudi/uBlock/issues/180
         // Whitelist directives need to be loaded once the PSL is available