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-rw-r--r--components/script/dom/testbinding.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/components/script/dom/testbinding.rs b/components/script/dom/testbinding.rs
index 567bf7f9bee..d783e876b98 100644
--- a/components/script/dom/testbinding.rs
+++ b/components/script/dom/testbinding.rs
@@ -30,6 +30,7 @@ use std::ptr;
use std::rc::Rc;
#[dom_struct]
+#[derive(HeapSizeOf)]
pub struct TestBinding {
reflector_: Reflector,
global: GlobalField,