diff --git a/components/script_traits/lib.rs b/components/script_traits/lib.rs
index ed0e09468ac..954c1386fa2 100644
--- a/components/script_traits/lib.rs
+++ b/components/script_traits/lib.rs
@@ -130,7 +130,7 @@ pub enum LayoutControlMsg {
 
 /// can be passed to `LoadUrl` to load a page with GET/POST
 /// parameters or headers
-#[derive(Clone, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct LoadData {
     /// The URL.
     pub url: ServoUrl,