diff --git a/src/ethproto/aa_bundler.py b/src/ethproto/aa_bundler.py
index be5d5ab..0294104 100644
--- a/src/ethproto/aa_bundler.py
+++ b/src/ethproto/aa_bundler.py
@@ -333,9 +333,9 @@ def __init__(
 
     def __str__(self):
         return (
-            f"Bundler(type={self.bundler_type}, entrypoint={self.entrypoint}, nonce_mode={self.nonce_mode}"
-            f"fixed_nonce_key={self.fixed_nonce_key}, verification_gas_factor={self.verification_gas_factor},"
-            f"gas_limit_factor={self.gas_limit_factor}, priority_gas_price_factor={self.priority_gas_price_factor},"
+            f"Bundler(type={self.bundler_type}, entrypoint={self.entrypoint}, nonce_mode={self.nonce_mode}, "
+            f"fixed_nonce_key={self.fixed_nonce_key}, verification_gas_factor={self.verification_gas_factor}, "
+            f"gas_limit_factor={self.gas_limit_factor}, priority_gas_price_factor={self.priority_gas_price_factor}, "
             f"base_gas_price_factor={self.base_gas_price_factor})"
         )