diff --git a/Uri/Http.php b/Uri/Http.php
index 40655c837..bc864dda4 100644
--- a/Uri/Http.php
+++ b/Uri/Http.php
@@ -247,6 +247,7 @@ final class Http implements UriInterface
     public function setRootPath(string $root) : void
     {
         $this->rootPath = \rtrim($root, '/');
+        $this->base     = $this->scheme . '://' . $this->host . ($this->port !== 80 ? ':' . $this->port : '') . $this->rootPath;
     }
 
     /**