diff --git a/ecdsa/accsigning/messages.go b/ecdsa/accsigning/messages.go
index 6250a38..39e1f44 100644
--- a/ecdsa/accsigning/messages.go
+++ b/ecdsa/accsigning/messages.go
@@ -1,7 +1,7 @@
 // Copyright (c) 2023, Circle Internet Financial, LTD.
 // All rights reserved
 //
-//	SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 package accsigning
 
 import (
diff --git a/ecdsa/cggplus/messages.go b/ecdsa/cggplus/messages.go
index 3306bcb..c6127c6 100644
--- a/ecdsa/cggplus/messages.go
+++ b/ecdsa/cggplus/messages.go
@@ -1,7 +1,7 @@
 // Copyright (c) 2023, Circle Internet Financial, LTD.
 // All rights reserved
 //
-//	SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: Apache-2.0
 package cggplus
 
 import (