diff --git a/src/newgrf_house.h b/src/newgrf_house.h
--- a/src/newgrf_house.h
+++ b/src/newgrf_house.h
@@ -44,9 +44,9 @@ struct HouseScopeResolver : public Scope
 	{
 	}
 
-	/* 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 object to be used for houses (feature 07 spritegroups). */
@@ -58,7 +58,7 @@ struct HouseResolverObject : public Reso
 			CallbackID callback = CBID_NO_CALLBACK, uint32 param1 = 0, uint32 param2 = 0,
 			bool not_yet_constructed = false, uint8 initial_random_bits = 0, CargoTypes watched_cargo_triggers = 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->house_scope;