diff --git a/man7/netlink.7 b/man7/netlink.7
index 794142f72..952aa7065 100644
--- a/man7/netlink.7
+++ b/man7/netlink.7
@@ -429,7 +429,7 @@ and
 is the size of the array.
 The array is filled with the full membership set of the
 socket, and the required array size is returned in
-.I optlen.
+.IR optlen .
 .TP
 .BR NETLINK_BROADCAST_ERROR " (since Linux 2.6.30)"
 .\"	commit be0c22a46cfb79ab2342bb28fde99afa94ef868e