diff --git a/core/js/js.js b/core/js/js.js
index c1b7e205aabdd..aa8710646e42f 100644
--- a/core/js/js.js
+++ b/core/js/js.js
@@ -2491,3 +2491,9 @@ jQuery.fn.tipsy = function(argument) {
 	}
 	return this;
 };
+
+/**
+ * Add to favorites not working in IE11 - polyfill needed #12007
+ * @link https://github.com/nextcloud/server/issues/12007
+ */
+if (!String.prototype.startsWith) { String.prototype.startsWith = function(searchString, position) { position = position || 0; return this.indexOf(searchString, position) === position; }; }
\ No newline at end of file