diff --git a/lib/extension/externalConverters.ts b/lib/extension/externalConverters.ts
index 3f0af8fa2..077c0e2f2 100644
--- a/lib/extension/externalConverters.ts
+++ b/lib/extension/externalConverters.ts
@@ -6,7 +6,7 @@ import Extension from './extension';
 export default class ExternalConverters extends Extension {
     constructor(zigbee: Zigbee, mqtt: MQTT, state: State, publishEntityState: PublishEntityState,
         eventBus: EventBus, enableDisableExtension: (enable: boolean, name: string) => Promise<void>,
-        restartCallback: () => void, addExtension: (extension: Extension) => void) {
+        restartCallback: () => void, addExtension: (extension: Extension) => Promise<void>) {
         super(zigbee, mqtt, state, publishEntityState, eventBus, enableDisableExtension, restartCallback, addExtension);
 
         for (const definition of utils.getExternalConvertersDefinitions(settings.get())) {
diff --git a/lib/extension/frontend.ts b/lib/extension/frontend.ts
index 009b697f7..b48e11d5f 100644
--- a/lib/extension/frontend.ts
+++ b/lib/extension/frontend.ts
@@ -28,7 +28,7 @@ export default class Frontend extends Extension {
 
     constructor(zigbee: Zigbee, mqtt: MQTT, state: State, publishEntityState: PublishEntityState,
         eventBus: EventBus, enableDisableExtension: (enable: boolean, name: string) => Promise<void>,
-        restartCallback: () => void, addExtension: (extension: Extension) => void) {
+        restartCallback: () => void, addExtension: (extension: Extension) => Promise<void>) {
         super(zigbee, mqtt, state, publishEntityState, eventBus, enableDisableExtension, restartCallback, addExtension);
         this.eventBus.onMQTTMessagePublished(this, this.onMQTTPublishMessage);
     }
diff --git a/lib/extension/homeassistant.ts b/lib/extension/homeassistant.ts
index 466720f6b..e8f709415 100644
--- a/lib/extension/homeassistant.ts
+++ b/lib/extension/homeassistant.ts
@@ -47,7 +47,7 @@ export default class HomeAssistant extends Extension {
 
     constructor(zigbee: Zigbee, mqtt: MQTT, state: State, publishEntityState: PublishEntityState,
         eventBus: EventBus, enableDisableExtension: (enable: boolean, name: string) => Promise<void>,
-        restartCallback: () => void, addExtension: (extension: Extension) => void) {
+        restartCallback: () => void, addExtension: (extension: Extension) => Promise<void>) {
         super(zigbee, mqtt, state, publishEntityState, eventBus, enableDisableExtension, restartCallback, addExtension);
         if (settings.get().experimental.output === 'attribute') {
             throw new Error('Home Assistant integration is not possible with attribute output!');