diff --git a/zk/base.py b/zk/base.py
index 5edecef..1eab4c5 100644
--- a/zk/base.py
+++ b/zk/base.py
@@ -192,8 +192,8 @@ class ZK(object):
 
         cmd_response = self.__send_command(command, command_string, checksum, session_id, reply_id, response_size)
         if cmd_response.get('status'):
-            serialnumber = self.__data_recv[8:].split('=')
-            return serialnumber[-1]
+            serialnumber = self.__data_recv[8:].split('=')[-1].strip('\x00|\x01\x10x')
+            return serialnumber
         else:
             raise Exception("Invalid response")