diff --git a/src/app/CMakeLists.txt b/src/app/CMakeLists.txt
index a262cca84..fd62226c8 100644
--- a/src/app/CMakeLists.txt
+++ b/src/app/CMakeLists.txt
@@ -560,7 +560,6 @@ add_library(app-lib
   modules.cpp
   modules/palettes.cpp
   pref/preferences.cpp
-  project.cpp
   recent_files.cpp
   res/palettes_loader_delegate.cpp
   res/resources_loader.cpp
diff --git a/src/app/project.cpp b/src/app/project.cpp
deleted file mode 100644
index a18c3cc8a..000000000
--- a/src/app/project.cpp
+++ /dev/null
@@ -1,23 +0,0 @@
-// Aseprite
-// Copyright (C) 2001-2015  David Capello
-//
-// This program is distributed under the terms of
-// the End-User License Agreement for Aseprite.
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include "app/project.h"
-
-namespace app {
-
-Project::Project()
-{
-}
-
-Project::~Project()
-{
-}
-
-} // namespace app
diff --git a/src/app/project.h b/src/app/project.h
deleted file mode 100644
index 14f92b460..000000000
--- a/src/app/project.h
+++ /dev/null
@@ -1,28 +0,0 @@
-// Aseprite
-// Copyright (C) 2001-2016  David Capello
-//
-// This program is distributed under the terms of
-// the End-User License Agreement for Aseprite.
-
-#ifndef APP_PROJECT_H_INCLUDED
-#define APP_PROJECT_H_INCLUDED
-#pragma once
-
-#include "app/project_observer.h"
-#include "base/disable_copying.h"
-#include "obs/observable.h"
-
-namespace app {
-
-  class Project : public obs::observable<ProjectObserver> {
-  public:
-    Project();
-    ~Project();
-
-  private:
-    DISABLE_COPYING(Project);
-  };
-
-} // namespace app
-
-#endif
diff --git a/src/app/project_event.h b/src/app/project_event.h
deleted file mode 100644
index dfc40ffa7..000000000
--- a/src/app/project_event.h
+++ /dev/null
@@ -1,28 +0,0 @@
-// Aseprite
-// Copyright (C) 2001-2015  David Capello
-//
-// This program is distributed under the terms of
-// the End-User License Agreement for Aseprite.
-
-#ifndef APP_PROJECT_EVENT_H_INCLUDED
-#define APP_PROJECT_EVENT_H_INCLUDED
-#pragma once
-
-namespace app {
-  class Doc;
-
-  class ProjectEvent {
-  public:
-    ProjectEvent(Doc* document)
-      : m_document(document) {
-    }
-
-    Doc* document() const { return m_document; }
-
-  private:
-    Doc* m_document;
-  };
-
-} // namespace app
-
-#endif
diff --git a/src/app/project_observer.h b/src/app/project_observer.h
deleted file mode 100644
index e556a624f..000000000
--- a/src/app/project_observer.h
+++ /dev/null
@@ -1,25 +0,0 @@
-// Aseprite
-// Copyright (C) 2001-2015  David Capello
-//
-// This program is distributed under the terms of
-// the End-User License Agreement for Aseprite.
-
-#ifndef APP_PROJECT_OBSERVER_H_INCLUDED
-#define APP_PROJECT_OBSERVER_H_INCLUDED
-#pragma once
-
-#include "app/project_event.h"
-
-namespace app {
-
-  class ProjectObserver {
-  public:
-    virtual ~ProjectObserver() { }
-    virtual void dispose() = 0;
-    virtual void onAddDocument(ProjectEvent& ev) = 0;
-    virtual void onRemoveDocument(ProjectEvent& ev) = 0;
-  };
-
-} // namespace app
-
-#endif