diff --git a/include/mqueue.h b/include/mqueue.h
index ac32b80de58b..2c97451ae4dc 100644
--- a/include/mqueue.h
+++ b/include/mqueue.h
@@ -29,12 +29,14 @@
 #ifndef _MQUEUE_H_
 #define _MQUEUE_H_
 
+#include <sys/cdefs.h>
 #include <sys/types.h>
 #include <sys/mqueue.h>
 
 struct sigevent;
 struct timespec;
 
+__BEGIN_DECLS
 int	mq_close(mqd_t);
 int	mq_getattr(mqd_t, struct mq_attr *);
 int	mq_notify(mqd_t, const struct sigevent *);
@@ -48,4 +50,5 @@ ssize_t	mq_timedreceive(mqd_t, char *__restrict, size_t,
 int	mq_timedsend(mqd_t, const char *, size_t, unsigned,
 		const struct timespec *);
 int	mq_unlink(const char *);
+__END_DECLS
 #endif