diff --git a/src/vehicles.rs b/src/vehicles.rs
index 1c6a16d..e2f4976 100644
--- a/src/vehicles.rs
+++ b/src/vehicles.rs
@@ -310,7 +310,7 @@ pub struct DriveState {
     pub power: i64,
     pub shift_state: Option<String>,
     /// gak: I've assumed this to be String.
-    pub speed: Option<String>,
+    pub speed: Option<i64>,
     pub timestamp: i64,
 
     pub active_route_traffic_minutes_delay: Option<f64>,