diff --git a/src/include/sys/time.h b/src/include/sys/time.h
index 6c9b7421b..2647d3588 100644
--- a/src/include/sys/time.h
+++ b/src/include/sys/time.h
@@ -6,6 +6,8 @@
  * Date and time
  */
 
+FILE_LICENCE ( GPL2_OR_LATER );
+
 #include <stdint.h>
 
 /** Seconds since the Epoch
diff --git a/src/include/time.h b/src/include/time.h
index bc73af4cd..452a544bb 100644
--- a/src/include/time.h
+++ b/src/include/time.h
@@ -6,6 +6,8 @@
  * Date and time
  */
 
+FILE_LICENCE ( GPL2_OR_LATER );
+
 #include <sys/time.h>
 #include <ipxe/time.h>