diff --git a/lib/libc/gen/err.3 b/lib/libc/gen/err.3
index 1e2d7c3d559..5eddc9fb863 100644
--- a/lib/libc/gen/err.3
+++ b/lib/libc/gen/err.3
@@ -98,7 +98,7 @@ and a space are output.
 If the
 .Fa fmt
 argument is not NULL, the
-.Xr printf 3
+.Xr printf 3 Ns
 -like formatted error message is output.
 The output is terminated by a newline character.
 .Pp