diff --git a/x/auth/client/tx.go b/x/auth/client/tx.go
index 3f377f2828..30aca5048c 100644
--- a/x/auth/client/tx.go
+++ b/x/auth/client/tx.go
@@ -121,7 +121,7 @@ func ReadTxsFromInput(txCfg client.TxConfig, filenames ...string) (scanner *Batc
 				return nil, fmt.Errorf("couldn't read %s: %w", f, err)
 			}
 
-			if _, err := buf.WriteString(string(bytes)); err != nil {
+			if _, err := buf.Write(bytes); err != nil {
 				return nil, fmt.Errorf("couldn't write to merged file: %w", err)
 			}
 		}