diff --git a/hid/DoorController.py b/hid/DoorController.py
index 2f7faf5..4011800 100644
--- a/hid/DoorController.py
+++ b/hid/DoorController.py
@@ -16,7 +16,8 @@ fieldnames = "CardNumber,CardFormat,PinRequired,PinCode,ExtendedAccess,ExpiryDat
 class RemoteError(Exception):
     def __init__(self, r):
         super().__init__(
-            f"Door Updating Error: {r.status_code} {r.reason}\n{r.text}")
+            "Door Updating Error: {} {}\n{}"
+            .format(r.status_code, r.reason, r.text))
 
 class DoorController():
     def __init__(self, ip, username, password, name="", access=""):