diff --git a/share/man/man4/miibus.4 b/share/man/man4/miibus.4
index 5c140b0c056..e41e02c4b2b 100644
--- a/share/man/man4/miibus.4
+++ b/share/man/man4/miibus.4
@@ -69,7 +69,7 @@ The implementation of
 .Nm
 was originally intended to have similar API interfaces
 to
-.Bxs 3.0
+.Bsx 3.0
 and
 .Nx ,
 but as a result are not well behaved newbus device drivers.