diff --git a/src/GitRepository.php b/src/GitRepository.php
index 9f9ee41..07a31dc 100644
--- a/src/GitRepository.php
+++ b/src/GitRepository.php
@@ -716,6 +716,7 @@ public static function isRemoteUrlReadable($url, array $refs = NULL)
 				'GIT_TERMINAL_PROMPT=0 git ls-remote',
 				'--heads',
 				'--quiet',
+				'--exit-code',
 				$url,
 				$refs,
 			)) . ' 2>&1', $output, $returnCode);