diff --git a/manticore/ethereum/manticore.py b/manticore/ethereum/manticore.py
index eb5a0b0ae..a8d499c5e 100644
--- a/manticore/ethereum/manticore.py
+++ b/manticore/ethereum/manticore.py
@@ -1108,7 +1108,7 @@ def multi_tx_analysis(
                 logger.info("Starting symbolic transaction: %d", tx_no)
 
                 # run_symbolic_tx
-                symbolic_data = self.make_symbolic_buffer(320)
+                symbolic_data = self.make_symbolic_buffer(640)
                 if tx_send_ether:
                     value = self.make_symbolic_value()
                 else: