diff --git a/src/driver/nbiot.be b/src/driver/nbiot.be
index a8de0633b21911298342fd2c24d944631385b0a3..6811117c3f1c529bc129b1dd7c84b9d2cb66042c 100644
--- a/src/driver/nbiot.be
+++ b/src/driver/nbiot.be
@@ -254,7 +254,7 @@ class NBIoTEnablePSMProcedure : NBIoTProcedure
     super(self).init(ser, request)
 
     self.cmd_register = NBIoTCommand('AT+CEREG=5\r\n', 'OK', 10)
-    self.cmd_enable_psm = NBIoTCommand('AT+CPSMS=1,,,\"01000111\",\"00000001\"\r\n', 'OK', 10)
+    self.cmd_enable_psm = NBIoTCommand('AT+CPSMS=1,,,\"01011111\",\"00000001\"\r\n', 'OK', 10)
     self.cmd_enable_sleep = NBIoTCommand('AT+QSCLK=1\r\n', 'OK', 10)
   end