diff --git a/mtik_cert_pusher/connector.py b/mtik_cert_pusher/connector.py
index 1c98b60..07ccbe8 100644
--- a/mtik_cert_pusher/connector.py
+++ b/mtik_cert_pusher/connector.py
@@ -65,11 +65,11 @@ class SSHConnector(Connector):
     def _ssh_option_args(self) -> list:
         result = []
         if self.ssh_config_path:
-            result.extend(["-F", self.ssh_config_path])
+            result.extend(["-F", str(self.ssh_config_path)])
         if self.ssh_user:
-            result.append("-oUser={self.ssh_user}")
+            result.append(f"-oUser={self.ssh_user}")
         if self.ssh_port:
-            result.append("-oPort={self.ssh_port:d}")
+            result.append(f"-oPort={self.ssh_port:d}")
         for k, v in self.extra_ssh_options.items():
             assert "=" not in k
             assert k