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-rw-r--r--components/script/dom/mouseevent.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/components/script/dom/mouseevent.rs b/components/script/dom/mouseevent.rs
index fd3831e535b..a160d7a6c1f 100644
--- a/components/script/dom/mouseevent.rs
+++ b/components/script/dom/mouseevent.rs
@@ -20,6 +20,7 @@ use std::cell::Cell;
use std::default::Default;
#[dom_struct]
+#[derive(HeapSizeOf)]
pub struct MouseEvent {
uievent: UIEvent,
screen_x: Cell<i32>,