diff --git a/app/src/main/res/layout/activity_book_source.xml b/app/src/main/res/layout/activity_book_source.xml
index 70ed38626..0293b0fff 100644
--- a/app/src/main/res/layout/activity_book_source.xml
+++ b/app/src/main/res/layout/activity_book_source.xml
@@ -9,7 +9,7 @@
         android:id="@+id/title_bar"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        app:attachToActivity="false"
+        app:displayHomeAsUp="true"
         app:title="@string/book_source" />
 
     <androidx.recyclerview.widget.RecyclerView