diff --git a/MotorControl/MotorServer.py b/MotorControl/MotorServer.py
index c82240a..bb13589 100755
--- a/MotorControl/MotorServer.py
+++ b/MotorControl/MotorServer.py
@@ -66,8 +66,8 @@ class MotorServicer(motorService_pb2_grpc.CarControlServicer):
         pvtKeyPath = '/home/pi/tls/device.key'
         pvtCertPath = '/home/pi/tls/device.crt'
 
-        pvtKeyBytes = open(pvtKeyPath).read()
-        pvtCertBytes = open(pvtCertPath).read()
+        pvtKeyBytes = bytes(open(pvtKeyPath).read())
+        pvtCertBytes = bytes(open(pvtCertPath).read())
 
         return grpc.ssl_channel_credentials(pvtCertBytes, pvtKeyBytes)