diff --git a/tarteaucitron.js b/tarteaucitron.js
index 3c9e177..a2a3a71 100644
--- a/tarteaucitron.js
+++ b/tarteaucitron.js
@@ -196,7 +196,7 @@ var tarteaucitron = {
         "use strict";
         var cdn = tarteaucitron.cdn,
             language = tarteaucitron.getLanguage(),
-            useJSDelivrMinifiedJS = cdn.includes("cdn.jsdelivr.net"),
+            useJSDelivrMinifiedJS = (cdn.indexOf('cdn.jsdelivr.net') >= 0),
             pathToLang = cdn + 'lang/tarteaucitron.' + language + (useJSDelivrMinifiedJS ? '.min' : '') + '.js?v=' + tarteaucitron.version,
             pathToServices = cdn + 'tarteaucitron.services' + (useJSDelivrMinifiedJS ? '.min' : '') + '.js?v=' + tarteaucitron.version,
             linkElement = document.createElement('link'),