diff --git a/api/src/services/trip_tracking.rs b/api/src/services/trip_tracking.rs
index 2217f74..3d426b9 100644
--- a/api/src/services/trip_tracking.rs
+++ b/api/src/services/trip_tracking.rs
@@ -16,7 +16,8 @@ pub struct LiveTripJson {
     pub trip_id: String,
     pub service_id: Option<String>,
     pub trip_headsign: String,
-    pub direction_id: i64,
+    #[serde(deserialize_with = "de_numstro")]
+    pub direction_id: Optiom<String>,
     #[serde(deserialize_with = "de_numstr")]
     pub block_id: String,
     pub start_time: Option<String>,