diff --git a/asdf/asdf.py b/asdf/asdf.py
index 5e34f0c7f..4a485972b 100644
--- a/asdf/asdf.py
+++ b/asdf/asdf.py
@@ -14,7 +14,12 @@
 from . import block, constants, generic_io, reference, schema, treeutil, util, versioning, yamlutil
 from ._helpers import validate_version
 from .config import config_context, get_config
-from .exceptions import AsdfConversionWarning, AsdfDeprecationWarning, AsdfWarning, ValidationError
+from .exceptions import (
+    AsdfConversionWarning,
+    AsdfDeprecationWarning,
+    AsdfWarning,
+    ValidationError,
+)
 from .extension import Extension, ExtensionProxy, _legacy, get_cached_extension_manager
 from .search import AsdfSearchResult
 from .tags.core import AsdfObject, ExtensionMetadata, HistoryEntry, Software