diff --git a/src/linkgraph/refresh.h b/src/linkgraph/refresh.h
--- a/src/linkgraph/refresh.h
+++ b/src/linkgraph/refresh.h
@@ -80,11 +80,10 @@ protected:
 	};
 
 	typedef std::vector<RefitDesc> RefitList;
-	typedef std::map<CargoID, uint> CapacitiesMap;
 	typedef std::set<Hop> HopSet;
 
 	Vehicle *vehicle;           ///< Vehicle for which the links should be refreshed.
-	CapacitiesMap capacities;   ///< Current added capacities per cargo ID in the consist.
+	uint capacities[NUM_CARGO]; ///< Current added capacities per cargo ID in the consist.
 	RefitList refit_capacities; ///< Current state of capacity remaining from previous refits versus overall capacity per vehicle in the consist.
 	HopSet *seen_hops;          ///< Hops already seen. If the same hop is seen twice we stop the algorithm. This is shared between all Refreshers of the same run.
 	CargoID cargo;              ///< Cargo given in last refit order.