diff --git a/src/dom/dom.js b/src/dom/dom.js
index ffc2330..19537b8 100644
--- a/src/dom/dom.js
+++ b/src/dom/dom.js
@@ -1545,7 +1545,7 @@ else if (Prototype.Browser.WebKit) {
   };
 }
 
-if ('outerHTML' in document.createElement('div')) {
+if ('outerHTML' in document.documentElement) {
   Element.Methods.replace = function(element, content) {
     element = $(element);