diff --git a/src/waypoint.h b/src/waypoint.h
--- a/src/waypoint.h
+++ b/src/waypoint.h
@@ -40,11 +40,6 @@ struct Waypoint : PoolItem<Waypoint, Way
 	inline bool IsValid() const { return this->xy != INVALID_TILE; }
 };
 
-static inline bool IsValidWaypointID(WaypointID index)
-{
-	return index < Waypoint::GetPoolSize() && Waypoint::Get(index)->IsValid();
-}
-
 #define FOR_ALL_WAYPOINTS_FROM(wp, start) for (wp = Waypoint::Get(start); wp != NULL; wp = (wp->index + 1U < Waypoint::GetPoolSize()) ? Waypoint::Get(wp->index + 1U) : NULL) if (wp->IsValid())
 #define FOR_ALL_WAYPOINTS(wp) FOR_ALL_WAYPOINTS_FROM(wp, 0)