diff --git a/app/Entities/Bookshelf.php b/app/Entities/Bookshelf.php
index 745611ba7..1db348b6b 100644
--- a/app/Entities/Bookshelf.php
+++ b/app/Entities/Bookshelf.php
@@ -104,4 +104,18 @@ class Bookshelf extends Entity
     {
         return $this->books()->where('id', '=', $book->id)->count() > 0;
     }
+
+    /**
+     * Add a book to the end of this shelf.
+     * @param Book $book
+     */
+    public function appendBook(Book $book)
+    {
+       if (!$this->contains($book)) {
+           return;
+       }
+
+       $maxOrder = $this->books()->max('order');
+       $this->books()->attach($book->id, ['order' => $maxOrder + 1]);
+    }
 }
diff --git a/app/Entities/Repos/BookRepo.php b/app/Entities/Repos/BookRepo.php
index c82780fea..91bc9a1b4 100644
--- a/app/Entities/Repos/BookRepo.php
+++ b/app/Entities/Repos/BookRepo.php
@@ -3,9 +3,7 @@
 
 namespace BookStack\Entities\Repos;
 
-
 use BookStack\Entities\Book;
-use BookStack\Entities\Bookshelf;
 use BookStack\Exceptions\NotFoundException;
 use BookStack\Exceptions\NotifyException;
 
@@ -25,21 +23,6 @@ class BookRepo extends EntityRepo
         return $book;
     }
 
-    /**
-     * Append a Book to a BookShelf.
-     * @param Bookshelf $shelf
-     * @param Book $book
-     */
-    public function appendBookToShelf(Bookshelf $shelf, Book $book)
-    {
-        if ($shelf->contains($book)) {
-            return;
-        }
-
-        $maxOrder = $shelf->books()->max('order');
-        $shelf->books()->attach($book->id, ['order' => $maxOrder + 1]);
-    }
-
     /**
      * Destroy the provided book and all its child entities.
      * @param Book $book
diff --git a/app/Http/Controllers/BookController.php b/app/Http/Controllers/BookController.php
index 1f9caf756..1a7872030 100644
--- a/app/Http/Controllers/BookController.php
+++ b/app/Http/Controllers/BookController.php
@@ -3,10 +3,9 @@
 use Activity;
 use BookStack\Auth\UserRepo;
 use BookStack\Entities\Book;
+use BookStack\Entities\Bookshelf;
 use BookStack\Entities\EntityContextManager;
 use BookStack\Entities\Repos\BookRepo;
-use BookStack\Entities\Repos\EntityRepo;
-use BookStack\Entities\ExportService;
 use BookStack\Exceptions\ImageUploadException;
 use BookStack\Exceptions\NotFoundException;
 use BookStack\Exceptions\NotifyException;
@@ -121,16 +120,18 @@ class BookController extends Controller
 
         $bookshelf = null;
         if ($shelfSlug !== null) {
+            /** @var Bookshelf $bookshelf */
             $bookshelf = $this->bookRepo->getEntityBySlug('bookshelf', $shelfSlug);
             $this->checkOwnablePermission('bookshelf-update', $bookshelf);
         }
 
+        /** @var Book $book */
         $book = $this->bookRepo->createFromInput('book', $request->all());
         $this->bookUpdateActions($book, $request);
         Activity::add($book, 'book_create', $book->id);
 
         if ($bookshelf) {
-            $this->bookRepo->appendBookToShelf($bookshelf, $book);
+            $bookshelf->appendBook($book);
             Activity::add($bookshelf, 'bookshelf_update');
         }