diff --git a/tests/test_importers.py b/tests/test_importers.py
index c286c6b90a6754758813739362ff4ee5b1207c2a..39c71df260a3c311973a930662771a05a1ff2f39 100644
--- a/tests/test_importers.py
+++ b/tests/test_importers.py
@@ -12,6 +12,8 @@ from import2ledger import errors, importers, strparse
 from . import Config, DATA_DIR
 
 class TestImporters:
+    FULL_CONFIG = Config({})
+
     with pathlib.Path(DATA_DIR, 'imports.yml').open() as yaml_file:
         test_data = yaml.load(yaml_file)
     for test in test_data:
@@ -46,6 +48,6 @@ class TestImporters:
                 assert actual == expected
 
     def test_loader(self):
-        all_importers = list(importers.load_all())
+        all_importers = {type(importer) for importer in importers.load_all(self.FULL_CONFIG)}
         for test in self.test_data:
             assert test['importer'] in all_importers