diff --git a/src/ajax.js b/src/ajax.js
index 6a757eb11..b39bc8ddb 100644
--- a/src/ajax.js
+++ b/src/ajax.js
@@ -293,7 +293,7 @@ jQuery.extend({
 
 		// Matches an absolute URL, and saves the domain
 		var parts = rurl.exec( s.url ),
-			remote = parts && (parts[1] && parts[1] !== location.protocol || parts[2] !== location.host);
+			remote = parts && (parts[1] && parts[1].toLowerCase() !== location.protocol || parts[2].toLowerCase() !== location.host);
 
 		// If we're requesting a remote document
 		// and trying to load JSON or Script with a GET