diff --git a/src/newgrf_roadtype.h b/src/newgrf_roadtype.h
--- a/src/newgrf_roadtype.h
+++ b/src/newgrf_roadtype.h
@@ -32,7 +32,7 @@ struct RoadTypeResolverObject : public R
 
 	RoadTypeResolverObject(const RoadTypeInfo *rti, TileIndex tile, TileContext context, RoadTypeSpriteGroup rtsg, uint32 param1 = 0, uint32 param2 = 0);
 
-	/* virtual */ ScopeResolver *GetScope(VarSpriteGroupScope scope = VSG_SCOPE_SELF, byte relative = 0)
+	ScopeResolver *GetScope(VarSpriteGroupScope scope = VSG_SCOPE_SELF, byte relative = 0) override
 	{
 		switch (scope) {
 			case VSG_SCOPE_SELF: return &this->roadtype_scope;
@@ -40,7 +40,7 @@ struct RoadTypeResolverObject : public R
 		}
 	}
 
-	/* virtual */ const SpriteGroup *ResolveReal(const RealSpriteGroup *group) const;
+	const SpriteGroup *ResolveReal(const RealSpriteGroup *group) const override;
 
 	GrfSpecFeature GetFeature() const override;
 	uint32 GetDebugID() const override;