diff --git a/src/Http/Url.php b/src/Http/Url.php
index 80a88b26..1ea48d1f 100644
--- a/src/Http/Url.php
+++ b/src/Http/Url.php
@@ -376,7 +376,8 @@ public function getAuthority()
 	 */
 	public function getHostUrl()
 	{
-		return ($this->scheme ? $this->scheme . ':' : '') . '//' . $this->getAuthority();
+		return ($this->scheme ? $this->scheme . ':' : '')
+			. (($authority = $this->getAuthority()) || $this->scheme ? '//' . $authority : '');
 	}
 
 
diff --git a/tests/Http/Url.httpScheme.phpt b/tests/Http/Url.httpScheme.phpt
index 8016cbc1..5cd6a37f 100644
--- a/tests/Http/Url.httpScheme.phpt
+++ b/tests/Http/Url.httpScheme.phpt
@@ -49,7 +49,7 @@ $url->setPath('');
 Assert::same('/',  $url->getPath());
 
 $url->setHost('')->setPath('');
-Assert::same('//?arg=value#anchor',  $url->absoluteUrl);
+Assert::same('?arg=value#anchor',  $url->absoluteUrl);
 
 $url->setPath('');
 Assert::same('',  $url->getPath());