diff --git a/src/timetable_cmd.cpp b/src/timetable_cmd.cpp
index 38218b8e24..4524fb74ba 100644
--- a/src/timetable_cmd.cpp
+++ b/src/timetable_cmd.cpp
@@ -323,7 +323,11 @@ CommandCost CmdSetTimetableStart(TileIndex tile, DoCommandFlag flags, uint32 p1,
 			w->lateness_counter = 0;
 			ClrBit(w->vehicle_flags, VF_TIMETABLE_STARTED);
 			/* Do multiplication, then division to reduce rounding errors. */
+#if WALLCLOCK_NETWORK_COMPATIBLE
 			w->timetable_start = start_date + idx * total_duration / num_vehs / DAY_TICKS;
+#else
+			w->timetable_start = start_date + idx * total_duration / num_vehs;
+#endif
 			SetWindowDirty(WC_VEHICLE_TIMETABLE, w->index);
 		}