diff --git a/buildbot_nix/__init__.py b/buildbot_nix/__init__.py
index f43542c..773df5e 100644
--- a/buildbot_nix/__init__.py
+++ b/buildbot_nix/__init__.py
@@ -832,7 +832,7 @@ class GerritNixConfigurator(ConfiguratorBase):
         self.gerrit_server = gerrit_server
         self.gerrit_user = gerrit_user
         self.gerrit_port = gerrit_port
-        self.gerrit_sshkey_path = gerrit_sshkey_path
+        self.gerrit_sshkey_path = str(gerrit_sshkey_path)
         self.gerrit_config = GerritConfig(domain=self.gerrit_server,
                                           username=self.gerrit_user,
                                           port=self.gerrit_port)