diff --git a/src/eccodes_prototypes.h b/src/eccodes_prototypes.h
index 6ae285fd2..7905f7978 100644
--- a/src/eccodes_prototypes.h
+++ b/src/eccodes_prototypes.h
@@ -1,3 +1,13 @@
+/*
+ * (C) Copyright 2005- ECMWF.
+ *
+ * This software is licensed under the terms of the Apache Licence Version 2.0
+ * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
+ * virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
+ */
+
 #pragma once
 
 #ifdef ECCODES_ON_WINDOWS
diff --git a/src/grib_scaling.h b/src/grib_scaling.h
index c48b3aa2c..3aebfe78f 100644
--- a/src/grib_scaling.h
+++ b/src/grib_scaling.h
@@ -1,3 +1,13 @@
+/*
+ * (C) Copyright 2005- ECMWF.
+ *
+ * This software is licensed under the terms of the Apache Licence Version 2.0
+ * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
+ * virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
+ */
+
 #pragma once
 
 /* Return n to the power of s */