diff --git a/src/boxes.rs b/src/boxes.rs
index b424b42..976f511 100644
--- a/src/boxes.rs
+++ b/src/boxes.rs
@@ -3,7 +3,7 @@ use serde::{Serialize, Deserialize};
 
 #[derive(Debug, Clone, Copy)]
 pub struct BoxCoords {
-    pub id: u32,
+    pub id: u16,
     pub x1: u32,
     pub y1: u32,
     pub x2: u32,
@@ -23,7 +23,7 @@ impl Display for BoxCoords {
 
 #[derive(Serialize, Deserialize, Debug, Clone, Copy)]
 pub struct NormalizedBoxCoords {
-    pub id: u32,
+    pub id: u16,
     pub x1: f32,
     pub y1: f32,
     pub x2: f32,