diff --git a/src/documents/management/commands/mixins.py b/src/documents/management/commands/mixins.py
index 847f027e1..1347957be 100644
--- a/src/documents/management/commands/mixins.py
+++ b/src/documents/management/commands/mixins.py
@@ -128,7 +128,7 @@ class CryptMixin:
                 salt=bytes.fromhex(self.salt),
                 iterations=self.key_iterations,
             )
-        else:
+        else:  # pragma: no cover
             raise CommandError(
                 f"{self.kdf_algorithm} is an unknown key derivation function",
             )