diff --git a/share/man/man3/queue.3 b/share/man/man3/queue.3
index c4ba2495060..ee45e02f2f5 100644
--- a/share/man/man3/queue.3
+++ b/share/man/man3/queue.3
@@ -538,7 +538,8 @@ after the element
 The macro
 .Nm STAILQ_LAST
 returns the last item on the tail queue.
-If the tail queue is empty the return value is NULL.
+If the tail queue is empty the return value is
+.Dv NULL .
 .Pp
 The macro
 .Nm STAILQ_NEXT
@@ -899,7 +900,8 @@ before the element
 The macro
 .Nm TAILQ_LAST
 returns the last item on the tail queue.
-If the tail queue is empty the return value is NULL.
+If the tail queue is empty the return value is
+.Dv NULL .
 .Pp
 The macro
 .Nm TAILQ_NEXT