diff --git a/src/antares_web_installer/app.py b/src/antares_web_installer/app.py
index 742b268..8a64276 100644
--- a/src/antares_web_installer/app.py
+++ b/src/antares_web_installer/app.py
@@ -94,7 +94,7 @@ def install_files(self):
 
         else:
             # copy all files from package
-            copytree(self.source_dir, self.target_dir)
+            copytree(self.source_dir, self.target_dir, dirs_exist_ok=True)
 
     def copy_files(self):
         """
diff --git a/tests/integration/test_app.py b/tests/integration/test_app.py
index 7d74741..1dbcf69 100644
--- a/tests/integration/test_app.py
+++ b/tests/integration/test_app.py
@@ -69,8 +69,8 @@ def test_run__empty_target(
         - The server is correctly started
         """
         # Patch the `get_desktop` function according to the current platform
-        platform = {"nt": "windows", "posix": "linux", "darwin": "darwin"}[os.name]
-        monkeypatch.setattr(f"pyshortcuts.{platform}.get_desktop", lambda: desktop_dir)
+        platform = {"nt": "_win32_shell", "posix": "_linux_shell"}[os.name]
+        monkeypatch.setattr(f"antares_web_installer.shortcuts.{platform}.get_desktop", lambda: desktop_dir)
 
         # Run the application
         app = App(source_dir=downloaded_dir, target_dir=program_dir, shortcut=True, launch=True)