diff --git a/router/src/http/types.rs b/router/src/http/types.rs
index dedaab60..a2a01c47 100644
--- a/router/src/http/types.rs
+++ b/router/src/http/types.rs
@@ -195,7 +195,9 @@ impl<'__s> ToSchema<'__s> for PredictInput {
 
 #[derive(Debug, Clone, Copy, PartialEq, Deserialize, ToSchema, Eq, Default)]
 pub(crate) enum TruncationDirection {
+    #[serde(alias = "left", alias = "Left")]
     Left,
+    #[serde(alias = "right", alias = "Right")]
     #[default]
     Right,
 }