diff --git a/api.py b/api.py
index 7c726cb..542a8f6 100644
--- a/api.py
+++ b/api.py
@@ -351,6 +351,20 @@ class ClientDetails(BaseModel):
     date_modification: Optional[str] = Field(
         None, description="Date de dernière modification (CT_DateMAJ)"
     )
+    
+    @field_validator("type_tiers", mode="before")
+    @classmethod
+    def convertir_type_tiers(cls, v):
+        if v is None:
+            return None
+        if isinstance(v, int):
+            mapping = {
+                0: "client",
+                1: "fournisseur",
+                2: "prospect",
+            }
+            return mapping.get(v)
+        return v
 
     class Config:
         json_schema_extra = {