diff --git a/module/icp/asm-x86_64/aes/aes_amd64.S b/module/icp/asm-x86_64/aes/aes_amd64.S
index c4870a28e..8129130cb 100644
--- a/module/icp/asm-x86_64/aes/aes_amd64.S
+++ b/module/icp/asm-x86_64/aes/aes_amd64.S
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: Brian-Gladman-3-Clause
 /*
  * ---------------------------------------------------------------------------
  * Copyright (c) 1998-2007, Brian Gladman, Worcester, UK. All rights reserved.
diff --git a/module/icp/asm-x86_64/aes/aeskey.c b/module/icp/asm-x86_64/aes/aeskey.c
index c3d1f2990..b12a5d60d 100644
--- a/module/icp/asm-x86_64/aes/aeskey.c
+++ b/module/icp/asm-x86_64/aes/aeskey.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: Brian-Gladman-3-Clause
 /*
  * ---------------------------------------------------------------------------
  * Copyright (c) 1998-2007, Brian Gladman, Worcester, UK. All rights reserved.
diff --git a/module/icp/asm-x86_64/aes/aesopt.h b/module/icp/asm-x86_64/aes/aesopt.h
index 472111f96..5741d5592 100644
--- a/module/icp/asm-x86_64/aes/aesopt.h
+++ b/module/icp/asm-x86_64/aes/aesopt.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: Brian-Gladman-3-Clause
 /*
  * ---------------------------------------------------------------------------
  * Copyright (c) 1998-2007, Brian Gladman, Worcester, UK. All rights reserved.
diff --git a/module/icp/asm-x86_64/aes/aestab.h b/module/icp/asm-x86_64/aes/aestab.h
index 33cdb6c6f..033cac85f 100644
--- a/module/icp/asm-x86_64/aes/aestab.h
+++ b/module/icp/asm-x86_64/aes/aestab.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: Brian-Gladman-3-Clause
 /*
  * ---------------------------------------------------------------------------
  * Copyright (c) 1998-2007, Brian Gladman, Worcester, UK. All rights reserved.