diff --git a/share/man/man5/ethers.5 b/share/man/man5/ethers.5
index 3384e27e6487..e10bf3009e3b 100644
--- a/share/man/man5/ethers.5
+++ b/share/man/man5/ethers.5
@@ -55,7 +55,7 @@ A ``+'' at
 the start of a line will cause the
 .Xr ethers 3
 library functions to use data stored in the
-.Xr NIS 4
+.Tn NIS
 .Pa ethers.byname
 and
 .Pa ethers.byaddr