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-rw-r--r--components/script/dom/progressevent.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/components/script/dom/progressevent.rs b/components/script/dom/progressevent.rs
index a181ba0c6d6..1dc1f2b9917 100644
--- a/components/script/dom/progressevent.rs
+++ b/components/script/dom/progressevent.rs
@@ -14,6 +14,7 @@ use dom::event::{Event, EventTypeId, EventBubbles, EventCancelable};
use util::str::DOMString;
#[dom_struct]
+#[derive(HeapSizeOf)]
pub struct ProgressEvent {
event: Event,
length_computable: bool,