diff --git a/webnotes/utils/verified_command.py b/webnotes/utils/verified_command.py
index f312d73e55..600bc5e591 100644
--- a/webnotes/utils/verified_command.py
+++ b/webnotes/utils/verified_command.py
@@ -18,7 +18,7 @@ def get_signature(params, nonce, secret=None):
 	if not secret:
 		secret = webnotes.local.conf.get("secret") or "secret"
 		
-	signature = hmac.new(nonce)
+	signature = hmac.new(str(nonce))
 	signature.update(secret)
 	signature.update(params)
 	return signature.hexdigest()
@@ -33,4 +33,4 @@ def get_url_using_bean(bean, cmd):
 	controller = bean.get_controller()
 	params = controller.get_signature_params()
 	params["cmd"] = cmd
-	return get_url(params, controller.get_nonce())
\ No newline at end of file
+	return get_url(params, controller.get_nonce())