diff --git a/platypush/backend/mqtt.py b/platypush/backend/mqtt.py
index 083dd355..75d84bc6 100644
--- a/platypush/backend/mqtt.py
+++ b/platypush/backend/mqtt.py
@@ -133,7 +133,7 @@ class MqttBackend(Backend):
         return handler
 
     @staticmethod
-    def _expand_path(path: str) -> str:
+    def _expandpath(path: str) -> str:
         return os.path.abspath(os.path.expanduser(path)) if path else path
 
     def _initialize_listeners(self, listeners_conf):