diff --git a/tests/integration/test_register_persister.py b/tests/integration/test_register_persister.py
index 65b9020..ff94a29 100644
--- a/tests/integration/test_register_persister.py
+++ b/tests/integration/test_register_persister.py
@@ -11,14 +11,12 @@ from vcr.persisters.filesystem import FilesystemPersister
 
 
 class CustomFilesystemPersister(object):
-    """
-    like default FilesystemPersister but
-    adds .test extension to cassette file
-    """
+    '''Behaves just like DefaultFilePersister but adds .test extension to the
+       cassette file'''
     @staticmethod
     def load_cassette(cassette_path, serializer):
         cassette_path += '.test'
-        return FilesystemPersister.load_cassette(cassette_path, serializer)
+        return FilesystemPersister().load_cassette(cassette_path, serializer)
 
     @staticmethod
     def save_cassette(cassette_path, cassette_dict, serializer):
diff --git a/vcr/persisters/filesystem.py b/vcr/persisters/filesystem.py
index 6e50529..43b52d4 100644
--- a/vcr/persisters/filesystem.py
+++ b/vcr/persisters/filesystem.py
@@ -6,8 +6,8 @@ from ..serialize import serialize, deserialize
 
 class FilesystemPersister(object):
 
-    @staticmethod
-    def load_cassette(cassette_path, serializer):
+    @classmethod
+    def load_cassette(cls, cassette_path, serializer):
         try:
             with open(cassette_path) as f:
                 cassette_content = f.read()