Index: src/wp-includes/ms-settings.php
===================================================================
--- src/wp-includes/ms-settings.php	(revision 27428)
+++ src/wp-includes/ms-settings.php	(working copy)
@@ -35,7 +35,7 @@
 		$_SERVER['HTTP_HOST'] = substr( $_SERVER['HTTP_HOST'], 0, -4 );
 	}
 
-	$path = stripslashes( $_SERVER['REQUEST_URI'] );
+	$path = strtolower( stripslashes( $_SERVER['REQUEST_URI'] ) );
 	if ( is_admin() ) {
 		$path = preg_replace( '#(.*)/wp-admin/.*#', '$1/', $path );
 	}