diff --git a/tools/virtio/virtio-trace/trace-agent-ctl.c b/tools/virtio/virtio-trace/trace-agent-ctl.c
index a2d0403c4f94a7..73d253d4b559a7 100644
--- a/tools/virtio/virtio-trace/trace-agent-ctl.c
+++ b/tools/virtio/virtio-trace/trace-agent-ctl.c
@@ -1,12 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Controller of read/write threads for virtio-trace
  *
  * Copyright (C) 2012 Hitachi, Ltd.
  * Created by Yoshihiro Yunomae <yoshihiro.yunomae.ez@hitachi.com>
  *            Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
- *
- * Licensed under GPL version 2 only.
- *
  */
 
 #define _GNU_SOURCE
diff --git a/tools/virtio/virtio-trace/trace-agent-rw.c b/tools/virtio/virtio-trace/trace-agent-rw.c
index 3aace5ea4842c1..ddfe7875eb16a8 100644
--- a/tools/virtio/virtio-trace/trace-agent-rw.c
+++ b/tools/virtio/virtio-trace/trace-agent-rw.c
@@ -1,12 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Read/write thread of a guest agent for virtio-trace
  *
  * Copyright (C) 2012 Hitachi, Ltd.
  * Created by Yoshihiro Yunomae <yoshihiro.yunomae.ez@hitachi.com>
  *            Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
- *
- * Licensed under GPL version 2 only.
- *
  */
 
 #define _GNU_SOURCE
diff --git a/tools/virtio/virtio-trace/trace-agent.c b/tools/virtio/virtio-trace/trace-agent.c
index 0a0a7dd4eff7cb..cdfe77c2b4c8fa 100644
--- a/tools/virtio/virtio-trace/trace-agent.c
+++ b/tools/virtio/virtio-trace/trace-agent.c
@@ -1,12 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Guest agent for virtio-trace
  *
  * Copyright (C) 2012 Hitachi, Ltd.
  * Created by Yoshihiro Yunomae <yoshihiro.yunomae.ez@hitachi.com>
  *            Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
- *
- * Licensed under GPL version 2 only.
- *
  */
 
 #define _GNU_SOURCE