diff --git a/sys/teken/teken.c b/sys/teken/teken.c
index 58f4f37162d5..9ca81e60719d 100644
--- a/sys/teken/teken.c
+++ b/sys/teken/teken.c
@@ -341,10 +341,7 @@ teken_set_winsize(teken_t *t, const teken_pos_t *p)
 {
 
 	t->t_winsize = *p;
-	/* XXX: bounds checking with cursor/etc! */
-	t->t_scrollreg.ts_begin = 0;
-	t->t_scrollreg.ts_end = t->t_winsize.tp_row;
-	t->t_originreg = t->t_scrollreg;
+	teken_subr_do_reset(t);
 }
 
 /*
diff --git a/sys/teken/teken_subr.h b/sys/teken/teken_subr.h
index 21982e26d592..38a29ee1ed21 100644
--- a/sys/teken/teken_subr.h
+++ b/sys/teken/teken_subr.h
@@ -927,6 +927,9 @@ teken_subr_do_reset(teken_t *t)
 
 	t->t_curattr = t->t_defattr;
 	t->t_cursor.tp_row = t->t_cursor.tp_col = 0;
+	t->t_scrollreg.ts_begin = 0;
+	t->t_scrollreg.ts_end = t->t_winsize.tp_row;
+	t->t_originreg = t->t_scrollreg;
 	t->t_stateflags = TS_AUTOWRAP;
 
 	teken_scs_set(t, 0, teken_scs_us_ascii);