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-rw-r--r--components/script/dom/htmlmapelement.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/components/script/dom/htmlmapelement.rs b/components/script/dom/htmlmapelement.rs
index 98927d6357c..64b4b7b55a7 100644
--- a/components/script/dom/htmlmapelement.rs
+++ b/components/script/dom/htmlmapelement.rs
@@ -13,6 +13,7 @@ use dom::node::{Node, NodeTypeId};
use util::str::DOMString;
#[dom_struct]
+#[derive(HeapSizeOf)]
pub struct HTMLMapElement {
htmlelement: HTMLElement
}