diff --git a/src/main.ts b/src/main.ts
index 4b0a678..546b087 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -386,7 +386,6 @@ import {
   composeMpvRuntimeHandlers,
   composeOverlayVisibilityRuntime,
   composeShortcutRuntimes,
-  composeSubtitlePrefetchRuntime,
   composeStartupLifecycleHandlers,
 } from './main/runtime/composers';
 import { createOverlayWindowRuntimeHandlers } from './main/runtime/overlay-window-runtime-handlers';
@@ -1396,13 +1395,14 @@ function scheduleSubtitlePrefetchRefresh(delayMs = 0): void {
     void refreshSubtitlePrefetchFromActiveTrackHandler();
   }, delayMs);
 }
-const subtitlePrefetchRuntime = composeSubtitlePrefetchRuntime({
-  subtitlePrefetchInitController,
-  refreshSubtitleSidebarFromSource: (sourcePath) => refreshSubtitleSidebarFromSource(sourcePath),
+const subtitlePrefetchRuntime = {
+  cancelPendingInit: () => subtitlePrefetchInitController.cancelPendingInit(),
+  initSubtitlePrefetch: subtitlePrefetchInitController.initSubtitlePrefetch,
+  refreshSubtitleSidebarFromSource: (sourcePath: string) => refreshSubtitleSidebarFromSource(sourcePath),
   refreshSubtitlePrefetchFromActiveTrack: () => refreshSubtitlePrefetchFromActiveTrackHandler(),
-  scheduleSubtitlePrefetchRefresh: (delayMs) => scheduleSubtitlePrefetchRefresh(delayMs),
+  scheduleSubtitlePrefetchRefresh: (delayMs?: number) => scheduleSubtitlePrefetchRefresh(delayMs),
   clearScheduledSubtitlePrefetchRefresh: () => clearScheduledSubtitlePrefetchRefresh(),
-});
+} as const;
 
 const overlayShortcutsRuntime = createOverlayShortcutsRuntimeService(
   createBuildOverlayShortcutsRuntimeMainDepsHandler({
diff --git a/src/main/runtime/composers/index.ts b/src/main/runtime/composers/index.ts
index f39206e..af44379 100644
--- a/src/main/runtime/composers/index.ts
+++ b/src/main/runtime/composers/index.ts
@@ -10,5 +10,4 @@ export * from './jellyfin-runtime-composer';
 export * from './mpv-runtime-composer';
 export * from './overlay-visibility-runtime-composer';
 export * from './shortcuts-runtime-composer';
-export * from './subtitle-prefetch-runtime-composer';
 export * from './startup-lifecycle-composer';
diff --git a/src/main/runtime/composers/subtitle-prefetch-runtime-composer.test.ts b/src/main/runtime/composers/subtitle-prefetch-runtime-composer.test.ts
deleted file mode 100644
index d391727..0000000
--- a/src/main/runtime/composers/subtitle-prefetch-runtime-composer.test.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-import assert from 'node:assert/strict';
-import test from 'node:test';
-import { composeSubtitlePrefetchRuntime } from './subtitle-prefetch-runtime-composer';
-
-test('composeSubtitlePrefetchRuntime returns subtitle prefetch runtime helpers', () => {
-  const composed = composeSubtitlePrefetchRuntime({
-    subtitlePrefetchInitController: {
-      cancelPendingInit: () => {},
-      initSubtitlePrefetch: async () => {},
-    },
-    refreshSubtitleSidebarFromSource: async () => {},
-    refreshSubtitlePrefetchFromActiveTrack: async () => {},
-    scheduleSubtitlePrefetchRefresh: () => {},
-    clearScheduledSubtitlePrefetchRefresh: () => {},
-  });
-
-  assert.equal(typeof composed.cancelPendingInit, 'function');
-  assert.equal(typeof composed.initSubtitlePrefetch, 'function');
-  assert.equal(typeof composed.refreshSubtitleSidebarFromSource, 'function');
-  assert.equal(typeof composed.refreshSubtitlePrefetchFromActiveTrack, 'function');
-  assert.equal(typeof composed.scheduleSubtitlePrefetchRefresh, 'function');
-  assert.equal(typeof composed.clearScheduledSubtitlePrefetchRefresh, 'function');
-});
diff --git a/src/main/runtime/composers/subtitle-prefetch-runtime-composer.ts b/src/main/runtime/composers/subtitle-prefetch-runtime-composer.ts
deleted file mode 100644
index f269eb8..0000000
--- a/src/main/runtime/composers/subtitle-prefetch-runtime-composer.ts
+++ /dev/null
@@ -1,32 +0,0 @@
-import type { SubtitlePrefetchInitController } from '../subtitle-prefetch-init';
-import type { ComposerInputs, ComposerOutputs } from './contracts';
-
-export type SubtitlePrefetchRuntimeComposerOptions = ComposerInputs<{
-  subtitlePrefetchInitController: SubtitlePrefetchInitController;
-  refreshSubtitleSidebarFromSource: (sourcePath: string) => Promise<void>;
-  refreshSubtitlePrefetchFromActiveTrack: () => Promise<void>;
-  scheduleSubtitlePrefetchRefresh: (delayMs?: number) => void;
-  clearScheduledSubtitlePrefetchRefresh: () => void;
-}>;
-
-export type SubtitlePrefetchRuntimeComposerResult = ComposerOutputs<{
-  cancelPendingInit: () => void;
-  initSubtitlePrefetch: SubtitlePrefetchInitController['initSubtitlePrefetch'];
-  refreshSubtitleSidebarFromSource: (sourcePath: string) => Promise<void>;
-  refreshSubtitlePrefetchFromActiveTrack: () => Promise<void>;
-  scheduleSubtitlePrefetchRefresh: (delayMs?: number) => void;
-  clearScheduledSubtitlePrefetchRefresh: () => void;
-}>;
-
-export function composeSubtitlePrefetchRuntime(
-  options: SubtitlePrefetchRuntimeComposerOptions,
-): SubtitlePrefetchRuntimeComposerResult {
-  return {
-    cancelPendingInit: () => options.subtitlePrefetchInitController.cancelPendingInit(),
-    initSubtitlePrefetch: options.subtitlePrefetchInitController.initSubtitlePrefetch,
-    refreshSubtitleSidebarFromSource: options.refreshSubtitleSidebarFromSource,
-    refreshSubtitlePrefetchFromActiveTrack: options.refreshSubtitlePrefetchFromActiveTrack,
-    scheduleSubtitlePrefetchRefresh: options.scheduleSubtitlePrefetchRefresh,
-    clearScheduledSubtitlePrefetchRefresh: options.clearScheduledSubtitlePrefetchRefresh,
-  };
-}