diff --git a/src/main/start-main-application/before-application-is-ready/before-application-is-ready-injection-token.ts b/src/main/start-main-application/before-application-is-ready/before-application-is-ready-injection-token.ts
index e4e099a42c..33320a16bb 100644
--- a/src/main/start-main-application/before-application-is-ready/before-application-is-ready-injection-token.ts
+++ b/src/main/start-main-application/before-application-is-ready/before-application-is-ready-injection-token.ts
@@ -3,9 +3,9 @@
  * Licensed under MIT License. See LICENSE in root directory for more information.
  */
 import { getInjectionToken } from "@ogre-tools/injectable";
-import type { Runnable } from "../run-many-for";
+import type { RunnableSync } from "../run-many-sync-for";
 
 export const beforeApplicationIsReadyInjectionToken =
-  getInjectionToken<Runnable>({
+  getInjectionToken<RunnableSync>({
     id: "before-application-is-ready",
   });
diff --git a/src/main/start-main-application/start-main-application.injectable.ts b/src/main/start-main-application/start-main-application.injectable.ts
index 21360f7ca6..26450828d1 100644
--- a/src/main/start-main-application/start-main-application.injectable.ts
+++ b/src/main/start-main-application/start-main-application.injectable.ts
@@ -8,16 +8,20 @@ import electronAppInjectable from "../electron-app/electron-app.injectable";
 import { beforeApplicationIsReadyInjectionToken } from "./before-application-is-ready/before-application-is-ready-injection-token";
 import { afterApplicationIsReadyInjectionToken } from "./after-application-is-ready/after-application-is-ready-injection-token";
 import { runManyFor } from "./run-many-for";
+import { runManySyncFor } from "./run-many-sync-for";
 
 const startMainApplicationInjectable = getInjectable({
   id: "start-main-application",
 
   instantiate: (di) => {
     const runMany = runManyFor(di);
+    const runManySync = runManySyncFor(di);
     const app = di.inject(electronAppInjectable);
 
     return async () => {
-      await runMany(beforeApplicationIsReadyInjectionToken)();
+      // Stuff happening before application is ready needs to be synchronous because of
+      // https://github.com/electron/electron/issues/21370
+      runManySync(beforeApplicationIsReadyInjectionToken)();
 
       await app.whenReady();