diff --git a/src/pages/viewer/hooks/useBookEntranceController.ts b/src/pages/viewer/hooks/useBookEntranceController.ts
index 86e841a..744b333 100644
--- a/src/pages/viewer/hooks/useBookEntranceController.ts
+++ b/src/pages/viewer/hooks/useBookEntranceController.ts
@@ -1,6 +1,5 @@
 import { useCallback, useRef, useState } from "react";
 import {
-  DEFAULT_ENTRANCE_DURATION_MS,
   ENTRANCE_ANIMATION_BASE_DELAY_MS,
   MAX_ENTRANCE_DELAY_MS,
 } from "@/shared/entranceAnimation";