diff --git a/interface.py b/interface.py
index e5b431a..296ea7f 100644
--- a/interface.py
+++ b/interface.py
@@ -84,7 +84,13 @@ def index():
                 files = music_library.get_files_recursively(folder)
             else:
                 files = music_library.get_files(folder)
-            files = list(map(lambda file: ('file', folder + '/' + file), files))
+            files = list(map(
+              lambda file: (
+                'file',
+                os.path.join(folder, file)
+              ),
+              files
+            ))
             print('Adding to playlist: ', files)
             var.playlist.extend(files)
         elif 'delete_music' in request.form: