diff --git a/src/saveload/vehicle_sl.cpp b/src/saveload/vehicle_sl.cpp
--- a/src/saveload/vehicle_sl.cpp
+++ b/src/saveload/vehicle_sl.cpp
@@ -496,6 +496,24 @@ void AfterLoadVehicles(bool part_of_load
 					UpdateAircraftCache(Aircraft::From(v), true);
 				}
 				break;
+
+			case VEH_DISASTER: {
+				auto *dv = DisasterVehicle::From(v);
+				if (dv->subtype == ST_SMALL_UFO && dv->state != 0) {
+					RoadVehicle *u = RoadVehicle::GetIfValid(v->dest_tile.base());
+					if (u != nullptr && u->IsFrontEngine()) {
+						/* Delete UFO targetting a vehicle which is already a target. */
+						if (u->disaster_vehicle != INVALID_VEHICLE) {
+							delete v;
+							continue;
+						} else {
+							u->disaster_vehicle = dv->index;
+						}
+					}
+				}
+				break;
+			}
+
 			default: break;
 		}