diff --git a/etherclient/extras.go b/etherclient/extras.go
index 9121734..bb9875e 100644
--- a/etherclient/extras.go
+++ b/etherclient/extras.go
@@ -21,7 +21,7 @@ import (
 // TraceCallTransaction contains the fields of the to-be-simulated transaction.
 type TraceCallTransaction struct {
 	From     string       `json:"from"`
-	To       string       `json:"to"`
+	To       string       `json:"to,omitempty"`
 	Gas      *hexutil.Big `json:"gas,omitempty"`
 	GasPrice *hexutil.Big `json:"gasPrice,omitempty"`
 	Value    *hexutil.Big `json:"value,omitempty"`