diff --git a/library/Requests/IRI.php b/library/Requests/IRI.php
index 44a95171b..8dc2fa284 100644
--- a/library/Requests/IRI.php
+++ b/library/Requests/IRI.php
@@ -688,10 +688,7 @@ public function is_valid() {
 		$isauthority = $this->iuserinfo !== null || $this->ihost !== null || $this->port !== null;
 		if ($this->ipath !== '' &&
 			(
-				$isauthority && (
-					$this->ipath[0] !== '/' ||
-					substr($this->ipath, 0, 2) === '//'
-				) ||
+				$isauthority && $this->ipath[0] !== '/' ||
 				(
 					$this->scheme === null &&
 					!$isauthority &&
diff --git a/tests/IRI.php b/tests/IRI.php
index 8df8567d2..77f241726 100644
--- a/tests/IRI.php
+++ b/tests/IRI.php
@@ -333,11 +333,6 @@ public function testInvalidAbsolutizeBase()
 		$this->assertFalse(Requests_IRI::absolutize('://not a URL', '../'));
 	}
 
-	public function testInvalidAbsolutizeRelative()
-	{
-		$this->assertFalse(Requests_IRI::absolutize('http://example.com/', 'http://example.com//not a URL'));
-	}
-
 	public function testFullGamut()
 	{
 		$iri = new Requests_IRI();