diff --git a/esphome/components/mdns/mdns_component.h b/esphome/components/mdns/mdns_component.h
index 32f8f16ec1..13c8ccf288 100644
--- a/esphome/components/mdns/mdns_component.h
+++ b/esphome/components/mdns/mdns_component.h
@@ -40,7 +40,7 @@ struct MDNSService {
   FixedVector<MDNSTXTRecord> txt_records;
 };
 
-class MDNSComponent : public Component {
+class MDNSComponent final : public Component {
  public:
   void setup() override;
   void dump_config() override;