diff --git a/src/doc/sprites.cpp b/src/doc/sprites.cpp
index 6c008c0b7..d780da5af 100644
--- a/src/doc/sprites.cpp
+++ b/src/doc/sprites.cpp
@@ -1,5 +1,5 @@
 // Aseprite Document Library
-// Copyright (c) 2001-2016 David Capello
+// Copyright (c) 2001-2018 David Capello
 //
 // This file is released under the terms of the MIT license.
 // Read LICENSE.txt for more information.
@@ -10,7 +10,6 @@
 
 #include "doc/sprites.h"
 
-#include "base/mutex.h"
 #include "base/unique_ptr.h"
 #include "doc/sprite.h"
 #include "doc/cel.h"
@@ -51,7 +50,6 @@ Sprite* Sprites::add(Sprite* spr)
   m_sprites.insert(begin(), spr);
   spr->setDocument(m_doc);
 
-  notify_observers(&SpritesObserver::onAddSprite, spr);
   return spr;
 }
 
diff --git a/src/doc/sprites.h b/src/doc/sprites.h
index 8ac80c1ac..da02cd3b0 100644
--- a/src/doc/sprites.h
+++ b/src/doc/sprites.h
@@ -1,5 +1,5 @@
 // Aseprite Document Library
-// Copyright (c) 2001-2016 David Capello
+// Copyright (c) 2001-2018 David Capello
 //
 // This file is released under the terms of the MIT license.
 // Read LICENSE.txt for more information.
@@ -12,15 +12,13 @@
 #include "doc/color_mode.h"
 #include "doc/object_id.h"
 #include "doc/sprite.h"
-#include "doc/sprites_observer.h"
-#include "obs/observable.h"
 
 #include <vector>
 
 namespace doc {
   class Document;
 
-  class Sprites : obs::observable<SpritesObserver> {
+  class Sprites {
   public:
     typedef std::vector<Sprite*>::iterator iterator;
     typedef std::vector<Sprite*>::const_iterator const_iterator;
diff --git a/src/doc/sprites_observer.h b/src/doc/sprites_observer.h
deleted file mode 100644
index 50856d991..000000000
--- a/src/doc/sprites_observer.h
+++ /dev/null
@@ -1,24 +0,0 @@
-// Aseprite Document Library
-// Copyright (c) 2001-2014 David Capello
-//
-// This file is released under the terms of the MIT license.
-// Read LICENSE.txt for more information.
-
-#ifndef DOC_SPRITES_OBSERVER_H_INCLUDED
-#define DOC_SPRITES_OBSERVER_H_INCLUDED
-#pragma once
-
-#include "doc/sprite.h"
-
-namespace doc {
-
-  class SpritesObserver {
-  public:
-    virtual ~SpritesObserver() { }
-    virtual void onAddSprite(Sprite* spr) { }
-    virtual void onRemoveSprite(Sprite* spr) { }
-  };
-
-} // namespace doc
-
-#endif