diff --git a/src/settings_gui.cpp b/src/settings_gui.cpp
--- a/src/settings_gui.cpp
+++ b/src/settings_gui.cpp
@@ -1359,6 +1359,7 @@ static SettingEntry _settings_ui_display
 	SettingEntry("gui.smallmap_land_colour"),
 	SettingEntry("gui.zoom_min"),
 	SettingEntry("gui.zoom_max"),
+	SettingEntry("gui.graph_line_thickness"),
 };
 /** Display options sub-page */
 static SettingsPage _settings_ui_display_page = {_settings_ui_display, lengthof(_settings_ui_display)};