diff --git a/openfisca_core/indexed_enums/enum_array.py b/openfisca_core/indexed_enums/enum_array.py
index 0cc1f197d3..7ea23a8ecb 100644
--- a/openfisca_core/indexed_enums/enum_array.py
+++ b/openfisca_core/indexed_enums/enum_array.py
@@ -150,8 +150,8 @@ def __ne__(self, other: Any) -> Union[ArrayType[bool], bool]:
 
     def _forbidden_operation(self, other: Any) -> NoReturn:
         raise TypeError(
-            "Forbidden operation. The only operations allowed on EnumArrays "
-            "are '==' and '!='.",
+            "Forbidden operation. The only operations allowed on "
+            f"{self.__class__.__name__}s are '==' and '!='.",
             )
 
     __add__ = _forbidden_operation