diff --git a/lib/src/git.rs b/lib/src/git.rs
index 8e41b9654..0403dc7a6 100644
--- a/lib/src/git.rs
+++ b/lib/src/git.rs
@@ -436,7 +436,7 @@ fn create_remote_callbacks() -> RemoteCallbacks<'static> {
     // crate shouldn't look in $HOME etc.
     callbacks.credentials(|_url, username_from_url, allowed_types| {
         if allowed_types.contains(git2::CredentialType::SSH_KEY) {
-            if std::env::var("SSH_AGENT_PID").is_ok() {
+            if std::env::var("SSH_AUTH_SOCK").is_ok() || std::env::var("SSH_AGENT_PID").is_ok() {
                 return git2::Cred::ssh_key_from_agent(username_from_url.unwrap());
             }
             if let Ok(home_dir) = std::env::var("HOME") {