diff --git a/lib/libthr/thread/thr_sem.c b/lib/libthr/thread/thr_sem.c
index c634034a6b7..5077429a2a4 100644
--- a/lib/libthr/thread/thr_sem.c
+++ b/lib/libthr/thread/thr_sem.c
@@ -31,6 +31,7 @@
 
 #include <stdlib.h>
 #include <errno.h>
+#include <time.h>
 #include <semaphore.h>
 #include <pthread.h>
 #include "thr_private.h"