diff --git a/MotorControl/MotorServer.py b/MotorControl/MotorServer.py
index 911f115..0378cf5 100755
--- a/MotorControl/MotorServer.py
+++ b/MotorControl/MotorServer.py
@@ -69,7 +69,7 @@ class MotorServicer(motorService_pb2_grpc.CarControlServicer):
         pvtKeyBytes = open(pvtKeyPath).read()
         pvtCertBytes = open(pvtCertPath).read()
 
-        return grpc.ssl_server_credentials([pvtKeyBytes, pvtCertBytes])
+        return grpc.ssl_server_credentials((pvtKeyBytes, pvtCertBytes))
 
 motor = Motor()
 servo = Servo(servo_pin)