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-rw-r--r--components/script/dom/uievent.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/components/script/dom/uievent.rs b/components/script/dom/uievent.rs
index e3411f35cb8..351a6d39443 100644
--- a/components/script/dom/uievent.rs
+++ b/components/script/dom/uievent.rs
@@ -21,6 +21,7 @@ use std::default::Default;
// https://dvcs.w3.org/hg/dom3events/raw-file/tip/html/DOM3-Events.html#interface-UIEvent
#[dom_struct]
+#[derive(HeapSizeOf)]
pub struct UIEvent {
event: Event,
view: MutNullableHeap<JS<Window>>,