diff --git a/raspberryPi/ultrasonic_client.py b/raspberryPi/ultrasonic_client.py
index 6b762276..c7b22ee0 100644
--- a/raspberryPi/ultrasonic_client.py
+++ b/raspberryPi/ultrasonic_client.py
@@ -49,7 +49,7 @@ def measure():
         distance = measure()
         print "Distance : %.1f cm" % distance
         # send data to the host every 0.5 sec
-        client_socket.send(str(distance))
+        client_socket.send((str(distance)).encode('utf-8'))
         time.sleep(0.5)
 finally:
     client_socket.close()