diff --git a/MotorControl/MotorServer.py b/MotorControl/MotorServer.py
index a2c82c8..5d4983c 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 = open(pvtKeyPath, 'rb').read()
+        pvtCertBytes = open(pvtCertPath, 'rb').read()
 
         return grpc.ssl_server_credentials([[pvtKeyBytes, pvtCertBytes]])