diff --git a/mopidy/core/actor.py b/mopidy/core/actor.py
index de6c64d0..32b5f47f 100644
--- a/mopidy/core/actor.py
+++ b/mopidy/core/actor.py
@@ -174,7 +174,7 @@ class Core(
         Save current state to disk.
         """
 
-        file_name = os.path.join(self._get_data_dir(), b'state.json.gz')
+        file_name = bytes(os.path.join(self._get_data_dir(), b'state.json.gz'))
         logger.info('Save state to %s', file_name)
 
         data = {}
@@ -206,7 +206,7 @@ class Core(
         :type coverage: list of string (see above)
         """
 
-        file_name = os.path.join(self._get_data_dir(), b'state.json.gz')
+        file_name = bytes(os.path.join(self._get_data_dir(), b'state.json.gz'))
         logger.info('Load state from %s', file_name)
 
         data = storage.load(file_name)
diff --git a/mopidy/internal/storage.py b/mopidy/internal/storage.py
index 660b22ae..3b7106a0 100644
--- a/mopidy/internal/storage.py
+++ b/mopidy/internal/storage.py
@@ -17,7 +17,7 @@ def load(path):
     Deserialize data from file.
 
     :param path: full path to import file
-    :type path: str
+    :type path: bytes
     :return: deserialized data
     :rtype: dict
     """
@@ -40,7 +40,7 @@ def dump(path, data):
     Serialize data to file.
 
     :param path: full path to export file
-    :type path: str
+    :type path: bytes
     :param data: dictionary containing data to save
     :type data: dict
     """