diff --git a/src/common/channel/request-channel-listener-injection-token.ts b/src/common/channel/request-channel-listener-injection-token.ts
index 0455bc2ec2..690b96d9dc 100644
--- a/src/common/channel/request-channel-listener-injection-token.ts
+++ b/src/common/channel/request-channel-listener-injection-token.ts
@@ -3,11 +3,19 @@
  * Licensed under MIT License. See LICENSE in root directory for more information.
  */
 import { getInjectionToken } from "@ogre-tools/injectable";
+import type { SetRequired } from "type-fest";
 import type { RequestChannel } from "./request-channel-injection-token";
 
 export interface RequestChannelListener<TChannel extends RequestChannel<any, any>> {
   channel: TChannel;
-  handler: (request: TChannel["_requestSignature"]) => TChannel["_responseSignature"];
+
+  handler: (
+    request: SetRequired<TChannel, "_requestSignature">["_requestSignature"]
+  ) =>
+    | SetRequired<TChannel, "_responseSignature">["_responseSignature"]
+    | Promise<
+        SetRequired<TChannel, "_responseSignature">["_responseSignature"]
+      >;
 }
 
 export const requestChannelListenerInjectionToken = getInjectionToken<RequestChannelListener<RequestChannel<any, any>>>(
diff --git a/src/main/app-paths/app-paths-request-channel-listener.injectable.ts b/src/main/app-paths/app-paths-request-channel-listener.injectable.ts
index 9cf12f5e65..3fd3aec572 100644
--- a/src/main/app-paths/app-paths-request-channel-listener.injectable.ts
+++ b/src/main/app-paths/app-paths-request-channel-listener.injectable.ts
@@ -3,21 +3,23 @@
  * Licensed under MIT License. See LICENSE in root directory for more information.
  */
 import { getInjectable } from "@ogre-tools/injectable";
+import type { RequestChannelListener } from "../../common/channel/request-channel-listener-injection-token";
 import { requestChannelListenerInjectionToken } from "../../common/channel/request-channel-listener-injection-token";
+import type { AppPathsChannel } from "../../common/app-paths/app-paths-channel.injectable";
 import appPathsChannelInjectable from "../../common/app-paths/app-paths-channel.injectable";
 import appPathsInjectable from "../../common/app-paths/app-paths.injectable";
 
 const appPathsRequestChannelListenerInjectable = getInjectable({
   id: "app-paths-request-channel-listener",
 
-  instantiate: (di) => {
+  instantiate: (di): RequestChannelListener<AppPathsChannel> => {
     const channel = di.inject(appPathsChannelInjectable);
     const appPaths = di.inject(appPathsInjectable);
 
-    return ({
+    return {
       channel,
       handler: () => appPaths,
-    });
+    };
   },
   injectionToken: requestChannelListenerInjectionToken,
 });