diff --git a/resources/setting_visibility/expert.cfg b/resources/setting_visibility/expert.cfg
index dee3188dd5..5257da75e8 100644
--- a/resources/setting_visibility/expert.cfg
+++ b/resources/setting_visibility/expert.cfg
@@ -371,6 +371,7 @@ prime_tower_base_height
 prime_tower_base_curve_magnitude
 prime_tower_raft_base_line_spacing
 prime_tower_max_bridging_distance
+prime_tower_min_shell_thickness
 ooze_shield_enabled
 ooze_shield_angle
 ooze_shield_dist