set HT to 1 in html mode
diff --git a/tmac/tmac.anhtml b/tmac/tmac.anhtml
index 148e8ef..5e3782b 100644
--- a/tmac/tmac.anhtml
+++ b/tmac/tmac.anhtml
@@ -4,6 +4,7 @@
 .de }F
 ..
 .hy 0
+.nr HT 1
 .de HY
 .hy 0
 ..