diff --git a/laborious/utils/import_password.py b/laborious/utils/import_password.py
index 5b61e8b..e74bf00 100644
--- a/laborious/utils/import_password.py
+++ b/laborious/utils/import_password.py
@@ -16,7 +16,6 @@ used as a metric label or written to the import record.
 from __future__ import annotations
 
 import base64
-import binascii
 from typing import Final
 
 from cryptography.exceptions import InvalidTag
@@ -55,7 +54,7 @@ def load_envelope_key(raw_key: str | None) -> bytes:
         raise EnvelopeError('the import password key is not configured')
     try:
         key = base64.b64decode(raw_key, validate=True)
-    except (binascii.Error, ValueError) as error:
+    except ValueError as error:
         raise EnvelopeError('the import password key is not valid base64') from error
     if len(key) != KEY_SIZE:
         raise EnvelopeError(f'the import password key must be {KEY_SIZE} bytes')
@@ -80,7 +79,7 @@ def decrypt_password_envelope(envelope: str, key: bytes) -> str:
         raise EnvelopeError('the import request carries no password envelope')
     try:
         payload = base64.b64decode(envelope, validate=True)
-    except (binascii.Error, ValueError) as error:
+    except ValueError as error:
         raise EnvelopeError('the password envelope is not valid base64') from error
     if len(payload) < MIN_ENVELOPE_SIZE:
         raise EnvelopeError('the password envelope is too short to hold a nonce and a tag')
diff --git a/tests/laborious/activities/test_model_import_status.py b/tests/laborious/activities/test_model_import_status.py
index 29980b2..fcd0efa 100644
--- a/tests/laborious/activities/test_model_import_status.py
+++ b/tests/laborious/activities/test_model_import_status.py
@@ -193,7 +193,7 @@ def test_run_name_survives_a_version_that_leaves_no_room():
 
 
 def test_run_name_is_deterministic():
-    assert derive_run_name('model', '4') == derive_run_name('model', '4')
+    assert derive_run_name('model', '4') == 'import-model-v4'
 
 
 def test_run_name_is_never_shorter_than_the_column_floor():