diff --git a/src/citymania/cm_bitstream.hpp b/src/citymania/cm_bitstream.hpp
index 095ca6d..8b80fe2 100644
--- a/src/citymania/cm_bitstream.hpp
+++ b/src/citymania/cm_bitstream.hpp
@@ -27,7 +27,7 @@ class BitOStream {
 };
 
 class BitIStreamUnexpectedEnd: public std::exception {
-	virtual const char* what() const throw() {
+	const char* what() const noexcept override {
 		return "Unexpected end of bit input stream";
 	}
 };
diff --git a/src/citymania/cm_console_cmds.cpp b/src/citymania/cm_console_cmds.cpp
index 60ea233..a6f7ae4 100644
--- a/src/citymania/cm_console_cmds.cpp
+++ b/src/citymania/cm_console_cmds.cpp
@@ -16,7 +16,7 @@ static void IConsoleHelp(const char *str)
     IConsolePrint(CC_WARNING, "- {}", str);
 }
 
-bool ConExport(byte argc, char *argv[]) {
+bool ConExport(byte argc, [[maybe_unused]] char *argv[]) {
     if (argc == 0) {
         IConsoleHelp("Exports various game data in json format to openttd.json file");
         return true;
diff --git a/src/citymania/cm_export.cpp b/src/citymania/cm_export.cpp
index daebe59..cb2b812 100644
--- a/src/citymania/cm_export.cpp
+++ b/src/citymania/cm_export.cpp
@@ -178,10 +178,7 @@ void WriteHouseSpecInfo(JsonWriter &j) {
 
 void WriteCargoSpecInfo(JsonWriter &j) {
     j.begin_list_with_key("cargo_specs");
-    const CargoSpec *cs;
-    char buffer[128];
     char cargo_label[16];
-    bool first = true;
     SetDParam(0, 123);
     for (const CargoSpec *cs : CargoSpec::Iterate()) {
         j.begin_dict();
@@ -242,12 +239,11 @@ void WritePaletteInfo(JsonWriter &j) {
         j.f << "]";
     }
     j.end_list();
-    const byte *remap = GetNonSprite(GB(PALETTE_TO_RED, 0, PALETTE_WIDTH), SpriteType::Recolour) + 1;
+    // const byte *remap = GetNonSprite(GB(PALETTE_TO_RED, 0, PALETTE_WIDTH), SpriteType::Recolour) + 1;
 }
 
 void WriteEngineInfo(JsonWriter &j) {
     j.begin_list_with_key("engines");
-    const Engine *e;
     for (const Engine *e : Engine::Iterate()) {
         if (e->type != VEH_TRAIN) continue;
         j.begin_dict();
diff --git a/src/citymania/cm_game.cpp b/src/citymania/cm_game.cpp
index 99ea2bc..95549e0 100644
--- a/src/citymania/cm_game.cpp
+++ b/src/citymania/cm_game.cpp
@@ -31,7 +31,7 @@ Game::Game() {
         this->towns_growth_tiles.clear();
     });
 
-    this->events.listen<event::TownBuilt>(event::Slot::GAME, [this] (const event::TownBuilt &event) {
+    this->events.listen<event::TownBuilt>(event::Slot::GAME, [] (const event::TownBuilt &event) {
         auto t = event.town;
         t->cm.hs_total = t->cm.hs_last_month = t->cm.hs_this_month = 0;
         t->cm.cs_total = t->cm.cs_last_month = t->cm.cs_this_month = 0;
@@ -68,13 +68,13 @@ Game::Game() {
         this->set_town_growth_tile(event.town, event.tile, TownGrowthTileState::NEW_HOUSE);
     });
 
-    this->events.listen<event::HouseCleared>(event::Slot::GAME, [this] (const event::HouseCleared &event) {
+    this->events.listen<event::HouseCleared>(event::Slot::GAME, [] (const event::HouseCleared &event) {
         if (!event.was_completed)
             event.town->cm.houses_constructing--;
         event.town->cm.real_population -= event.house_spec->population;
     });
 
-    this->events.listen<event::HouseCompleted>(event::Slot::GAME, [this] (const event::HouseCompleted &event) {
+    this->events.listen<event::HouseCompleted>(event::Slot::GAME, [] (const event::HouseCompleted &event) {
         event.town->cm.houses_constructing--;
     });
 
@@ -86,7 +86,7 @@ Game::Game() {
         }
     });
 
-    this->events.listen<event::TownCachesRebuilt>(event::Slot::GAME, [this] (const event::TownCachesRebuilt &event) {
+    this->events.listen<event::TownCachesRebuilt>(event::Slot::GAME, [this] (const event::TownCachesRebuilt&) {
         this->towns_growth_tiles.clear();
         this->towns_growth_tiles_last_month.clear();
         for (Town *town : Town::Iterate()) {
@@ -109,7 +109,7 @@ Game::Game() {
         }
     });
 
-    this->events.listen<event::CargoAccepted>(event::Slot::GAME, [this] (const event::CargoAccepted &event) {
+    this->events.listen<event::CargoAccepted>(event::Slot::GAME, [] (const event::CargoAccepted &event) {
         event.company->cur_economy.cm.cargo_income[event.cargo_type] += event.profit;
     });
 }