diff --git a/src/txs.rs b/src/txs.rs
index c1f8e66..a272bf1 100644
--- a/src/txs.rs
+++ b/src/txs.rs
@@ -65,6 +65,7 @@ pub fn generate_auth_info(
     Ok(AuthInfo {
         signer_infos: vec![signer_info],
         fee: Some(fee),
+        tip: None,
     })
 }