diff --git a/bind-mount.c b/bind-mount.c
index 4246c15..808d5df 100644
--- a/bind-mount.c
+++ b/bind-mount.c
@@ -1,5 +1,6 @@
 /* bubblewrap
  * Copyright (C) 2016 Alexander Larsson
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/bind-mount.h b/bind-mount.h
index 2ec9031..1fac3e5 100644
--- a/bind-mount.h
+++ b/bind-mount.h
@@ -1,5 +1,6 @@
 /* bubblewrap
  * Copyright (C) 2016 Alexander Larsson
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/bubblewrap.c b/bubblewrap.c
index fc2edbb..2e13fd0 100644
--- a/bubblewrap.c
+++ b/bubblewrap.c
@@ -1,5 +1,6 @@
 /* bubblewrap
  * Copyright (C) 2016 Alexander Larsson
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/network.c b/network.c
index 208f4eb..9477cb7 100644
--- a/network.c
+++ b/network.c
@@ -1,5 +1,6 @@
 /* bubblewrap
  * Copyright (C) 2016 Alexander Larsson
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/network.h b/network.h
index e5f4c76..3346b49 100644
--- a/network.h
+++ b/network.h
@@ -1,5 +1,6 @@
 /* bubblewrap
  * Copyright (C) 2016 Alexander Larsson
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/tests/libtest.sh b/tests/libtest.sh
index 2b2f0d6..c888ad8 100644
--- a/tests/libtest.sh
+++ b/tests/libtest.sh
@@ -4,6 +4,7 @@
 # Add non-bubblewrap-specific code to libtest-core.sh instead.
 #
 # Copyright (C) 2017 Colin Walters <walters@verbum.org>
+# SPDX-License-Identifier: LGPL-2.0-or-later
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
diff --git a/utils.c b/utils.c
index ea343df..3753923 100644
--- a/utils.c
+++ b/utils.c
@@ -1,5 +1,6 @@
 /* bubblewrap
  * Copyright (C) 2016 Alexander Larsson
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/utils.h b/utils.h
index 1a29dbc..317d6d7 100644
--- a/utils.h
+++ b/utils.h
@@ -1,5 +1,6 @@
 /* bubblewrap
  * Copyright (C) 2016 Alexander Larsson
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public