diff --git a/app/core/_blockchain/ton/wallet_v3cr3.py b/app/core/_blockchain/ton/wallet_v3cr3.py
index c0f3d99..2dd03a3 100644
--- a/app/core/_blockchain/ton/wallet_v3cr3.py
+++ b/app/core/_blockchain/ton/wallet_v3cr3.py
@@ -86,6 +86,7 @@ class WalletV3CR3(WalletContract):
         signing_message = begin_cell().store_cell(self.create_signing_message(seqno=0))
         _commands = begin_cell().store_uint(0, 32)
         signing_message = signing_message.store_ref(_commands.end_cell())
+        signing_message.end_cell()
         signature = sign_message(
             bytes(signing_message.bytes_hash()), self.options['private_key']).signature