diff --git a/lib/libpmc/pmu-events/jsmn.h b/lib/libpmc/pmu-events/jsmn.h
index 1f3b369cc44f..cb92cabeb5b8 100644
--- a/lib/libpmc/pmu-events/jsmn.h
+++ b/lib/libpmc/pmu-events/jsmn.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: MIT */
 /* $FreeBSD$ */
 #ifndef __JSMN_H_
 #define __JSMN_H_