diff --git a/main.py b/main.py
index dc606b1..5f623ec 100755
--- a/main.py
+++ b/main.py
@@ -366,7 +366,7 @@ def topupTask(task, modem):
         adviceLastSN(task['requestId'], modem)
         return
     except:
-        message = "USSD Error: Something wrong when executing USSD topup. Signal strength: {0}".format((modem.signalStrength)
+        message = "USSD Error: Something wrong when executing USSD topup. Signal strength: {0}".format(modem.signalStrength)
         logger.warning(message)
         pushTopupStatus(task['requestId'], '68', message)
         #waitForResultSmsAfterUssdError(modem, task['requestId'], message)