diff --git a/tuya_iot/openapi.py b/tuya_iot/openapi.py
index 10e6f23..a5b6f07 100644
--- a/tuya_iot/openapi.py
+++ b/tuya_iot/openapi.py
@@ -38,8 +38,8 @@ def __init__(self, token_response: dict[str, Any] = None):
         result = token_response.get("result", {})
 
         self.expire_time = (
-            token_response.get("t", 0)
-            + result.get("expire", result.get("expire_time", 0)) * 1000
+            int(token_response.get("t", 0))
+            + int(result.get("expire", result.get("expire_time", 0))) * 1000
         )
         self.access_token = result.get("access_token", "")
         self.refresh_token = result.get("refresh_token", "")