diff --git a/include/yolo_v2_class.hpp b/include/yolo_v2_class.hpp
index b6bea64a..feafaa61 100644
--- a/include/yolo_v2_class.hpp
+++ b/include/yolo_v2_class.hpp
@@ -72,7 +72,7 @@ public:
     LIB_API int get_net_color_depth() const;
 
     LIB_API std::vector<bbox_t> tracking_id(std::vector<bbox_t> cur_bbox_vec, bool const change_history = true,
-                                                int const frames_story = 10, int const max_dist = 150);
+                                                int const frames_story = 5, int const max_dist = 40);
 
     std::vector<bbox_t> detect_resized(image_t img, int init_w, int init_h, float thresh = 0.2, bool use_mean = false)
     {