diff --git a/fireblocks_sdk/api_types.py b/fireblocks_sdk/api_types.py
index e886d2a..14bf9ed 100644
--- a/fireblocks_sdk/api_types.py
+++ b/fireblocks_sdk/api_types.py
@@ -150,7 +150,7 @@ def __init__(self, content, bip44addressIndex=None, bip44change=None, derivation
 
 
 class RawMessage(object):
-    def __init__(self, messages, algorithm):
+    def __init__(self, messages, algorithm=None):
         """Defines raw message
 
         Args: