diff --git a/types/iobroker/index.d.ts b/types/iobroker/index.d.ts
index 71fa1b4d78..e9b2f64e67 100644
--- a/types/iobroker/index.d.ts
+++ b/types/iobroker/index.d.ts
@@ -1627,11 +1627,11 @@ declare global {
             removeAllListeners(event?: "ready" | "unload" | "stateChange" | "objectChange" | "message"): this;
         } // end interface Adapter
 
-        type ReadyHandler = () => void;
-        type ObjectChangeHandler = (id: string, obj: ioBroker.Object | null | undefined) => void;
-        type StateChangeHandler = (id: string, obj: State | null | undefined) => void;
-        type MessageHandler = (obj: Message) => void;
-        type UnloadHandler = (callback: EmptyCallback) => void;
+        type ReadyHandler = () => void | Promise<void>;
+        type ObjectChangeHandler = (id: string, obj: ioBroker.Object | null | undefined) => void | Promise<void>;
+        type StateChangeHandler = (id: string, obj: State | null | undefined) => void | Promise<void>;
+        type MessageHandler = (obj: Message) => void | Promise<void>;
+        type UnloadHandler = (callback: EmptyCallback) => void | Promise<void>;
 
         type EmptyCallback = () => void;
         type ErrorCallback = (err?: string) => void;
diff --git a/types/iobroker/iobroker-tests.ts b/types/iobroker/iobroker-tests.ts
index 0302a5041a..0b707098fa 100644
--- a/types/iobroker/iobroker-tests.ts
+++ b/types/iobroker/iobroker-tests.ts
@@ -20,6 +20,16 @@ adapter
     ;
 adapter.removeAllListeners();
 
+// Test adapter constructor options
+let adapterOptions: ioBroker.AdapterOptions = {
+    name: "foo",
+    ready: readyHandler,
+    stateChange: stateChangeHandler,
+    objectChange: objectChangeHandler,
+    message: messageHandler,
+    unload: unloadHandler,
+};
+
 function readyHandler() { }
 
 function stateChangeHandler(id: string, state: ioBroker.State | null | undefined) {