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-rw-r--r--components/script/dom/processinginstruction.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/components/script/dom/processinginstruction.rs b/components/script/dom/processinginstruction.rs
index 41dac86ed04..6b4ae05f592 100644
--- a/components/script/dom/processinginstruction.rs
+++ b/components/script/dom/processinginstruction.rs
@@ -14,6 +14,7 @@ use util::str::DOMString;
/// An HTML processing instruction node.
#[dom_struct]
+#[derive(HeapSizeOf)]
pub struct ProcessingInstruction {
characterdata: CharacterData,
target: DOMString,