diff --git a/www/common/common-util.js b/www/common/common-util.js
index aed4dd5d2..f6ec8d4df 100644
--- a/www/common/common-util.js
+++ b/www/common/common-util.js
@@ -202,5 +202,9 @@ define([], function () {
         };
     };
 
+    Util.slice = function (A) {
+        return Array.prototype.slice.call(A);
+    };
+
     return Util;
 });
diff --git a/www/common/cryptpad-common.js b/www/common/cryptpad-common.js
index 79bbe9b70..84f7c47a6 100644
--- a/www/common/cryptpad-common.js
+++ b/www/common/cryptpad-common.js
@@ -103,6 +103,7 @@ define([
     common.getAppType = Util.getAppType;
     common.notAgainForAnother = Util.notAgainForAnother;
     common.uid = Util.uid;
+    common.slice = Util.slice;
 
     // import hash utilities for export
     var createRandomHash = common.createRandomHash = Hash.createRandomHash;