diff --git a/share/man/man9/mbuf.9 b/share/man/man9/mbuf.9
index 0ab55b1176f..ce3ee3ef8ad 100644
--- a/share/man/man9/mbuf.9
+++ b/share/man/man9/mbuf.9
@@ -152,8 +152,8 @@ buffer for data.
 The total size of an
 .Vt mbuf ,
 .Dv MSIZE ,
-is a machine-dependent constant defined in
-.In machine/param.h .
+is a constant defined in
+.In sys/param.h .
 The
 .Vt mbuf
 header includes: