diff --git a/custom_components/gree/gree_protocol.py b/custom_components/gree/gree_protocol.py
index a089235..0bedc19 100644
--- a/custom_components/gree/gree_protocol.py
+++ b/custom_components/gree/gree_protocol.py
@@ -106,7 +106,7 @@ async def test_connection(config):
     encryption_version = config[CONF_ENCRYPTION_VERSION]
     encryption_key = config[CONF_ENCRYPTION_KEY]
 
-    mac_addr = config.get(CONF_MAC).encode().replace(b":", b"").decode("utf-8").lower()
+    mac_addr = config.get(CONF_MAC).encode().replace(b":", b"").replace(b"-", b"").decode("utf-8").lower()
     if "@" in mac_addr:
         mac_addr = mac_addr.split("@", 1)[1]