diff --git a/src/components/script/script_task.rs b/src/components/script/script_task.rs
index 45bdedf456d..8f3d13c897d 100644
--- a/src/components/script/script_task.rs
+++ b/src/components/script/script_task.rs
@@ -524,7 +524,7 @@ pub struct ScriptTask {
/// The JavaScript runtime.
pub js_runtime: js::rust::rt,
- pub mouse_over_targets: RefCell