diff --git a/libmapper/app.c b/libmapper/app.c
index 485a507..7b72a5e 100644
--- a/libmapper/app.c
+++ b/libmapper/app.c
@@ -1,18 +1,6 @@
-/**
- * Copyright 2016 IBM Corporation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: Copyright 2016 IBM Corporation
+
 #include "mapper.h"
 
 #include <errno.h>
diff --git a/libmapper/mapper.c b/libmapper/mapper.c
index 28ad314..a3459ab 100644
--- a/libmapper/mapper.c
+++ b/libmapper/mapper.c
@@ -1,18 +1,6 @@
-/**
- * Copyright © 2016 IBM Corporation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: Copyright 2016 IBM Corporation
+
 #include "mapper.h"
 
 #include "internal.h"