diff --git a/system/Router/Router.php b/system/Router/Router.php
index b865936882fa..953d06a2f8d2 100644
--- a/system/Router/Router.php
+++ b/system/Router/Router.php
@@ -469,7 +469,7 @@ protected function checkRoutes(string $uri): bool
 				{
 					$val = preg_replace('#^' . $key . '$#', $val, $uri);
 				}
-				elseif (strpos($key, '/') !== false)
+				elseif (strpos($val, '/') !== false)
 				{
 					$val = str_replace('/', '\\', $val);
 				}