diff --git a/app/core.cpp b/app/core.cpp
index f41294ff4..9dea0b981 100644
--- a/app/core.cpp
+++ b/app/core.cpp
@@ -538,7 +538,7 @@ void Core::DeclareTypesForQt()
   qRegisterMetaType<Decoder::RetrieveState>();
   qRegisterMetaType<TimeRange>();
   qRegisterMetaType<Color>();
-  qRegisterMetaType<ProjectPtr>();
+  qRegisterMetaType<OLIVE_NAMESPACE::ProjectPtr>();
 }
 
 void Core::StartGUI(bool full_screen)
diff --git a/app/core.h b/app/core.h
index 20ef0a4ea..8c6043e8a 100644
--- a/app/core.h
+++ b/app/core.h
@@ -477,12 +477,12 @@ private:
 private slots:
   void SaveAutorecovery();
 
-  void ProjectSaveSucceeded(ProjectPtr p);
+  void ProjectSaveSucceeded(OLIVE_NAMESPACE::ProjectPtr p);
 
   /**
    * @brief Adds a project to the "open projects" list
    */
-  void AddOpenProject(ProjectPtr p);
+  void AddOpenProject(OLIVE_NAMESPACE::ProjectPtr p);
 
   void ImportTaskComplete(QUndoCommand* command);
 
diff --git a/app/project/projectloadmanager.h b/app/project/projectloadmanager.h
index 1e656ff26..6343293c6 100644
--- a/app/project/projectloadmanager.h
+++ b/app/project/projectloadmanager.h
@@ -36,7 +36,7 @@ protected:
   virtual void Action() override;
 
 signals:
-  void ProjectLoaded(ProjectPtr project);
+  void ProjectLoaded(OLIVE_NAMESPACE::ProjectPtr project);
 
 private:
   QString filename_;
diff --git a/app/project/projectsavemanager.h b/app/project/projectsavemanager.h
index 88be5f840..fb5d1fe79 100644
--- a/app/project/projectsavemanager.h
+++ b/app/project/projectsavemanager.h
@@ -33,7 +33,7 @@ public:
   ProjectSaveManager(ProjectPtr project);
 
 signals:
-  void ProjectSaveSucceeded(ProjectPtr p);
+  void ProjectSaveSucceeded(OLIVE_NAMESPACE::ProjectPtr p);
 
 protected:
   virtual void Action() override;