diff --git a/yli/survival.py b/yli/survival.py
index 7af6e78..1992dc3 100644
--- a/yli/survival.py
+++ b/yli/survival.py
@@ -249,6 +249,9 @@ def calc_survfunc_turnbull(time_left, time_right, *, ci=True, step_loc=0.5, maxi
 	if se_method:
 		hpstat_args.append('--se-method')
 		hpstat_args.append(se_method)
+	elif not ci:
+		hpstat_args.append('--se-method')
+		hpstat_args.append('none')
 	if zero_tolerance:
 		hpstat_args.append('--zero-tolerance')
 		hpstat_args.append(str(zero_tolerance))