diff --git a/stdimage/management/commands/rendervariations.py b/stdimage/management/commands/rendervariations.py
index e1c4eb0..0f8de6c 100644
--- a/stdimage/management/commands/rendervariations.py
+++ b/stdimage/management/commands/rendervariations.py
@@ -16,10 +16,6 @@
 BAR = None
 
 
-def class_to_path(cls):
-    return '.'.join((cls.__module__, cls.__class__.__name__))
-
-
 class MemoryUsageWidget(progressbar.widgets.WidgetBase):
     def __call__(self, progress, data):
         return 'RAM: {0:10.1f} MB'.format(
@@ -64,7 +60,7 @@ def render(field, images, count, replace):
                 file_name=file_name,
                 variations=field.variations,
                 replace=replace,
-                storage=class_to_path(field.storage),
+                storage=field.storage.deconstruct()[0],
             )
             for file_name in images
         ]
diff --git a/tests/models.py b/tests/models.py
index 736a1ac..1471a24 100644
--- a/tests/models.py
+++ b/tests/models.py
@@ -1,3 +1,4 @@
+from django.core.files.storage import FileSystemStorage
 from django.db import models
 from django.db.models.signals import post_delete, pre_save
 
@@ -104,6 +105,16 @@ class ManualVariationsModel(CustomManagerModel):
     )
 
 
+class MyStorageModel(CustomManagerModel):
+    """delays creation of 150x150 thumbnails until it is called manually"""
+    image = StdImageField(
+        upload_to=UploadTo(name='image', path='img'),
+        variations={'thumbnail': (150, 150, True)},
+        render_variations=False,
+        storage=FileSystemStorage(),
+    )
+
+
 def render_job(**kwargs):
     render_variations(**kwargs)
     return False
diff --git a/tests/settings.py b/tests/settings.py
index 674f7c9..4fadc8b 100644
--- a/tests/settings.py
+++ b/tests/settings.py
@@ -23,6 +23,8 @@
     'tests'
 )
 
+DEFAULT_FILE_STORAGE = 'tests.storage.MyFileSystemStorage'
+
 MIDDLEWARE_CLASSES = (
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
diff --git a/tests/storage.py b/tests/storage.py
new file mode 100644
index 0000000..3a6c3ee
--- /dev/null
+++ b/tests/storage.py
@@ -0,0 +1,5 @@
+from django.core.files.storage import FileSystemStorage
+
+
+class MyFileSystemStorage(FileSystemStorage):
+    pass
diff --git a/tests/test_commands.py b/tests/test_commands.py
index 99883c8..9f209e0 100644
--- a/tests/test_commands.py
+++ b/tests/test_commands.py
@@ -4,7 +4,7 @@
 import pytest
 from django.core.management import call_command
 
-from tests.models import ManualVariationsModel, ThumbnailModel
+from tests.models import ManualVariationsModel, MyStorageModel, ThumbnailModel
 
 
 @pytest.mark.django_db
@@ -62,3 +62,14 @@ def test_replace(self, image_upload_file):
         assert os.path.exists(file_path)
         after = os.path.getmtime(file_path)
         assert before != after
+
+    def test_none_default_storage(self, image_upload_file):
+        obj = MyStorageModel.customer_manager.create(
+            image=image_upload_file
+        )
+        file_path = obj.image.thumbnail.path
+        call_command(
+            'rendervariations',
+            'tests.MyStorageModel.image'
+        )
+        assert os.path.exists(file_path)