diff --git a/examples/learning_to_track_ex.cpp b/examples/learning_to_track_ex.cpp
index 2d707fedf..c8992c84b 100644
--- a/examples/learning_to_track_ex.cpp
+++ b/examples/learning_to_track_ex.cpp
@@ -36,7 +36,7 @@ struct detection
         copyable and contain a public typedef named track_type that tells us the track type
         meant for use with this detection object.
     */
-    typedef class track track_type;
+    typedef struct track track_type;