diff --git a/src/newgrf_engine.h b/src/newgrf_engine.h
--- a/src/newgrf_engine.h
+++ b/src/newgrf_engine.h
@@ -40,9 +40,9 @@ struct VehicleScopeResolver : public Sco
 
 	void SetVehicle(const Vehicle *v) { this->v = v; }
 
-	/* virtual */ uint32 GetRandomBits() const;
-	/* virtual */ uint32 GetVariable(byte variable, uint32 parameter, bool *available) const;
-	/* virtual */ uint32 GetTriggers() const;
+	uint32 GetRandomBits() const override;
+	uint32 GetVariable(byte variable, uint32 parameter, bool *available) const override;
+	uint32 GetTriggers() const override;
 };
 
 /** Resolver for a vehicle (chain) */
@@ -64,9 +64,9 @@ struct VehicleResolverObject : public Re
 	VehicleResolverObject(EngineID engine_type, const Vehicle *v, WagonOverride wagon_override, bool info_view = false,
 			CallbackID callback = CBID_NO_CALLBACK, uint32 callback_param1 = 0, uint32 callback_param2 = 0);
 
-	/* virtual */ ScopeResolver *GetScope(VarSpriteGroupScope scope = VSG_SCOPE_SELF, byte relative = 0);
+	ScopeResolver *GetScope(VarSpriteGroupScope scope = VSG_SCOPE_SELF, byte relative = 0) override;
 
-	/* virtual */ const SpriteGroup *ResolveReal(const RealSpriteGroup *group) const;
+	const SpriteGroup *ResolveReal(const RealSpriteGroup *group) const override;
 };
 
 static const uint TRAININFO_DEFAULT_VEHICLE_WIDTH   = 29;