diff --git a/frontend/views.py b/frontend/views.py
index abac806..e24a544 100644
--- a/frontend/views.py
+++ b/frontend/views.py
@@ -131,7 +131,8 @@ class UpdateProjectView(ProtectedFormView, SingleObjectMixin):
         original_filename = str(original_file)
         
         """ Put file into temporary folder for analysis """
-        relative_path = default_storage.save('tmp/project_' + str(self.project_id) + '.ctt4', ContentFile(original_file.read()))
+        target_filename = 'tmp/project_' + str(self.project_id) + '.ctt4'
+        relative_path = default_storage.save(target_filename, ContentFile(original_file.read()))
         temp_sqlite = os.path.join(settings.MEDIA_ROOT, relative_path)
         
         """ Test if SQLite is a valid citavi project. """
@@ -145,9 +146,14 @@ class UpdateProjectView(ProtectedFormView, SingleObjectMixin):
         if citavi_project_valid == False:
             """ TODO: Put up an error message or something. """
             pass
-        else:            
+        else:
+            target_filename = 'citavi/project_' + str(self.project_id) + '.ctt4'
+            """ Remove eventually pre-existing citavi file. """
+            if default_storage.exists(target_filename):
+                default_storage.delete(target_filename)
+
             """ Actually store file in citavi folder """
-            relative_path = default_storage.save('citavi/project_' + str(self.project_id) + '.ctt4', ContentFile(original_file.read()))
+            relative_path = default_storage.save(target_filename, ContentFile(original_file.read()))
             sqlite_path = os.path.join(settings.MEDIA_ROOT, relative_path)
 
             """ Store new original filename in Project """
@@ -157,5 +163,7 @@ class UpdateProjectView(ProtectedFormView, SingleObjectMixin):
             
             """ Refresh identities from citavi project. """
             # TODO
+            #citavi_project = Citavi.CitaviProject(sqlite_path)
+            #del citavi_project
         return super(UpdateProjectView, self).form_valid(form)