diff --git a/internal/domain/task/value_objects/fd/algo_config.py b/internal/domain/task/value_objects/fd/algo_config.py
index 26b0758..b09b2f5 100644
--- a/internal/domain/task/value_objects/fd/algo_config.py
+++ b/internal/domain/task/value_objects/fd/algo_config.py
@@ -88,7 +88,6 @@ class PFDTaneConfig(BaseFdConfig):
     ]
     error: Annotated[float, Field(ge=0, le=1, description=descriptions["error"])]
     error_measure: Annotated[
-        str,
         Literal["per_tuple", "per_value"],
         Field(description=descriptions["error_measure"]),
     ]