diff --git a/core/startup/ParameterConfirmationToken.php b/core/startup/ParameterConfirmationToken.php
index fe85d293f..288488b6b 100644
--- a/core/startup/ParameterConfirmationToken.php
+++ b/core/startup/ParameterConfirmationToken.php
@@ -91,7 +91,7 @@ class ParameterConfirmationToken {
 		unset($params['url']);
 
 		// Join them all together into the original URL
-		$location = "$proto://" . $host . BASE_URL . $url . ($params ? '?'.http_build_query($params) : '');
+		$location = "$proto://" . $host . '/' . ltrim(BASE_URL, '/') . $url . ($params ? '?'.http_build_query($params) : '');
 
 		// And redirect
 		if (headers_sent()) {