diff --git a/selfprivacy_api/backup/providers/__init__.py b/selfprivacy_api/backup/providers/__init__.py
index 4f8bb75..8cb2a74 100644
--- a/selfprivacy_api/backup/providers/__init__.py
+++ b/selfprivacy_api/backup/providers/__init__.py
@@ -21,6 +21,8 @@ PROVIDER_MAPPING: dict[BackupProviderEnum, Type[AbstractBackupProvider]] = {
 def get_provider(
     provider_type: BackupProviderEnum,
 ) -> Type[AbstractBackupProvider]:
+    if provider_type not in PROVIDER_MAPPING.keys():
+        raise LookupError("could not look up provider", provider_type)
     return PROVIDER_MAPPING[provider_type]
 
 
diff --git a/tests/test_backup.py b/tests/test_backup.py
index 55741cc..b96f8e7 100644
--- a/tests/test_backup.py
+++ b/tests/test_backup.py
@@ -244,7 +244,7 @@ def test_error_censoring_loginkey(dummy_service, backups, fp):
     secret = "aSecretNYA"
 
     Backups.set_provider(
-        BackupProvider.BACKBLAZE, login="meow", key=secret, location="moon"
+        ProviderEnum.BACKBLAZE, login="meow", key=secret, location="moon"
     )
     assert Backups.provider().key == secret