diff --git a/lib/engine/last_trip_api.ex b/lib/engine/last_trip_api.ex
index ca1bbd4a0..92c3b6674 100644
--- a/lib/engine/last_trip_api.ex
+++ b/lib/engine/last_trip_api.ex
@@ -1,4 +1,4 @@
 defmodule Engine.LastTripAPI do
-  @callback get_recent_departures(String.t()) :: [Map.t()]
+  @callback get_recent_departures(String.t()) :: map()
   @callback is_last_trip?(String.t()) :: boolean()
 end