diff --git a/src/applications/diffusion/protocol/DiffusionGitCommandEngine.php b/src/applications/diffusion/protocol/DiffusionGitCommandEngine.php
index 168b18caa5..995e156d8e 100644
--- a/src/applications/diffusion/protocol/DiffusionGitCommandEngine.php
+++ b/src/applications/diffusion/protocol/DiffusionGitCommandEngine.php
@@ -27,6 +27,7 @@ final class DiffusionGitCommandEngine
     $env['HOME'] = PhabricatorEnv::getEmptyCWD();
 
     $env['GIT_SSH'] = $this->getSSHWrapper();
+    $env['GIT_SSH_VARIANT'] = 'ssh';
 
     if ($this->isAnyHTTPProtocol()) {
       $uri = $this->getURI();