diff --git a/src/vehicle_gui.cpp b/src/vehicle_gui.cpp
--- a/src/vehicle_gui.cpp
+++ b/src/vehicle_gui.cpp
@@ -1830,7 +1830,7 @@ static const NWidgetPart _nested_train_v
 		NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_VD_DECREASE_SERVICING_INTERVAL), SetFill(0, 1),
 				SetDataTip(AWV_DECREASE, STR_VEHICLE_DETAILS_DECREASE_SERVICING_INTERVAL_TOOLTIP),
 		NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_VD_INCREASE_SERVICING_INTERVAL), SetFill(0, 1),
-				SetDataTip(AWV_INCREASE, STR_VEHICLE_DETAILS_DECREASE_SERVICING_INTERVAL_TOOLTIP),
+				SetDataTip(AWV_INCREASE, STR_VEHICLE_DETAILS_INCREASE_SERVICING_INTERVAL_TOOLTIP),
 		NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_VD_SERVICE_INTERVAL_DROPDOWN), SetFill(0, 1),
 				SetDataTip(STR_EMPTY, STR_SERVICE_INTERVAL_DROPDOWN_TOOLTIP),
 		NWidget(WWT_PANEL, COLOUR_GREY, WID_VD_SERVICING_INTERVAL), SetFill(1, 1), SetResize(1, 0), EndContainer(),