4 files changed, 4 insertions, 4 deletions
diff --git a/src/include/ipxe/gdbserial.h b/src/include/ipxe/gdbserial.h
index a3b56173c..d02fb8d1b 100644
--- a/src/include/ipxe/gdbserial.h
+++ b/src/include/ipxe/gdbserial.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 struct gdb_transport;
 
diff --git a/src/include/ipxe/gdbstub.h b/src/include/ipxe/gdbstub.h
index 319606747..13ca33ddb 100644
--- a/src/include/ipxe/gdbstub.h
+++ b/src/include/ipxe/gdbstub.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdint.h>
 #include <ipxe/tables.h>
diff --git a/src/include/ipxe/gdbudp.h b/src/include/ipxe/gdbudp.h
index db7a451c9..a1c091522 100644
--- a/src/include/ipxe/gdbudp.h
+++ b/src/include/ipxe/gdbudp.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 struct sockaddr_in;
 struct gdb_transport;
diff --git a/src/include/ipxe/serial.h b/src/include/ipxe/serial.h
index b47b1d125..86d05370d 100644
--- a/src/include/ipxe/serial.h
+++ b/src/include/ipxe/serial.h
@@ -7,7 +7,7 @@
  *
  */
 
-FILE_LICENCE ( GPL2_OR_LATER );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 extern void serial_putc ( int ch );
 extern int serial_getc ( void );