diff --git a/core/src/main/java/org/kiwix/kiwixmobile/core/main/CoreMainActivity.java b/core/src/main/java/org/kiwix/kiwixmobile/core/main/CoreMainActivity.java
index 72292b093..519b8a889 100644
--- a/core/src/main/java/org/kiwix/kiwixmobile/core/main/CoreMainActivity.java
+++ b/core/src/main/java/org/kiwix/kiwixmobile/core/main/CoreMainActivity.java
@@ -357,6 +357,7 @@ public abstract class CoreMainActivity extends BaseActivity
       new BookOnDiskDelegate.BookDelegate(sharedPreferenceUtil,
         bookOnDiskItem -> {
           open(bookOnDiskItem);
+          getCurrentWebView().activateNightMode();
           return Unit.INSTANCE;
         },
         null,