diff --git a/utils/mctp-astlpc-daemon.c b/utils/mctp-astlpc-daemon.c
index c5c428e..b07c80a 100644
--- a/utils/mctp-astlpc-daemon.c
+++ b/utils/mctp-astlpc-daemon.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
 
 #include <assert.h>
 #include <err.h>
diff --git a/utils/mctp-demux-daemon.c b/utils/mctp-demux-daemon.c
index cc2311b..edde1bd 100644
--- a/utils/mctp-demux-daemon.c
+++ b/utils/mctp-demux-daemon.c
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
+
 #define _GNU_SOURCE
 
 #include <assert.h>
diff --git a/utils/mctp-in.c b/utils/mctp-in.c
index 8444d59..ce06bb4 100644
--- a/utils/mctp-in.c
+++ b/utils/mctp-in.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
 
 #include <assert.h>
 #include <err.h>
diff --git a/utils/mctp-pipe.c b/utils/mctp-pipe.c
index 35dc577..45ff886 100644
--- a/utils/mctp-pipe.c
+++ b/utils/mctp-pipe.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
 
 #include <assert.h>
 #include <err.h>