diff --git a/newlib/libc/sys/rtems/include/arpa/inet.h b/newlib/libc/sys/rtems/include/arpa/inet.h
index 14cd24e36..fdcb4c9b4 100644
--- a/newlib/libc/sys/rtems/include/arpa/inet.h
+++ b/newlib/libc/sys/rtems/include/arpa/inet.h
@@ -1,5 +1,5 @@
 /*-
- * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-License-Identifier: (BSD-3-Clause AND ISC)
  *
  * ++Copyright++ 1983, 1993
  * -
diff --git a/newlib/libc/sys/rtems/include/netdb.h b/newlib/libc/sys/rtems/include/netdb.h
index 0e64a9c02..86d4938fb 100644
--- a/newlib/libc/sys/rtems/include/netdb.h
+++ b/newlib/libc/sys/rtems/include/netdb.h
@@ -1,5 +1,5 @@
 /*-
- * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-License-Identifier: (BSD-3-Clause AND ISC)
  *
  * Copyright (c) 1980, 1983, 1988, 1993
  *	The Regents of the University of California.  All rights reserved.