diff --git a/src/mistral_common/protocol/instruct/validator.py b/src/mistral_common/protocol/instruct/validator.py
index 8f9a7cb..58d7acc 100644
--- a/src/mistral_common/protocol/instruct/validator.py
+++ b/src/mistral_common/protocol/instruct/validator.py
@@ -217,7 +217,7 @@ def _validate_message_order(self, messages: List[UATS]) -> None:
 
                 if current_role not in expected_roles:
                     raise InvalidMessageStructureException(
-                        f"Unexpected role '{current_role.value}' after role '{previous_role.value}'"
+                        f"Unexpected role '{current_role}' after role '{previous_role}'"
                     )
 
             previous_role = current_role
@@ -228,7 +228,7 @@ def _validate_last_message(self, message: UATS) -> None:
         if self._mode == ValidationMode.finetuning:
             if last_message_role != Roles.assistant:
                 raise InvalidMessageStructureException(
-                    f"Expected last role Assistant for finetuning but got {last_message_role.value}"
+                    f"Expected last role Assistant for finetuning but got {last_message_role}"
                 )
         else:
             bad_assistant = isinstance(message, AssistantMessage) and not message.prefix
@@ -236,7 +236,7 @@ def _validate_last_message(self, message: UATS) -> None:
             if bad_assistant and bad_role:
                 raise InvalidMessageStructureException(
                     f"Expected last role User or Tool (or Assistant with prefix True) for serving"
-                    f" but got {last_message_role.value}"
+                    f" but got {last_message_role}"
                 )
 
     def _validate_message_list_structure(self, messages: List[UATS]) -> None: