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-rw-r--r--components/script/dom/validitystate.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/components/script/dom/validitystate.rs b/components/script/dom/validitystate.rs
index 71750f4315f..f14ebddff6f 100644
--- a/components/script/dom/validitystate.rs
+++ b/components/script/dom/validitystate.rs
@@ -10,6 +10,7 @@ use dom::window::Window;
// https://html.spec.whatwg.org/#validitystate
#[dom_struct]
+#[derive(HeapSizeOf)]
pub struct ValidityState {
reflector_: Reflector,
state: u8,