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-rw-r--r--program/js/common.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/program/js/common.js b/program/js/common.js
index 72a68bb8b..977eb9057 100644
--- a/program/js/common.js
+++ b/program/js/common.js
@@ -93,7 +93,7 @@ function roundcube_browser()
this.xmlhttp_test = function()
{
var activeX_test = new Function("try{var o=new ActiveXObject('Microsoft.XMLHTTP');return true;}catch(err){return false;}");
- this.xmlhttp = (window.XMLHttpRequest || (window.ActiveXObject && activeX_test()));
+ this.xmlhttp = window.XMLHttpRequest || (('ActiveXObject' in window) && activeX_test());
return this.xmlhttp;
};