diff --git a/variables.h b/variables.h
--- a/variables.h
+++ b/variables.h
@@ -215,6 +215,7 @@ typedef struct Patches {
 	uint32 npf_rail_depot_reverse_penalty; /* The penalty for reversing in depots */
 	uint32 npf_buoy_penalty; /* The penalty for going over (through) a buoy */
 	uint32 npf_water_curve_penalty; /* The penalty for curves */
+	uint32 npf_road_curve_penalty; /* The penalty for curves */
 
 	bool population_in_label; // Show the population of a town in his label?
 } Patches;