1 files changed, 7 insertions, 0 deletions
diff --git a/components/script/dom/bindings/num.rs b/components/script/dom/bindings/num.rs
index fde24d08421..03b0c743f9f 100644
--- a/components/script/dom/bindings/num.rs
+++ b/components/script/dom/bindings/num.rs
@@ -4,6 +4,7 @@
 
 //! The `Finite<T>` struct.
 
+use heapsize::HeapSizeOf;
 use num_traits::Float;
 use std::ops::Deref;
 
@@ -38,3 +39,9 @@ impl<T: Float> Deref for Finite<T> {
         value
     }
 }
+
+impl<T: Float + HeapSizeOf> HeapSizeOf for Finite<T> {
+    fn heap_size_of_children(&self) -> usize {
+        (**self).heap_size_of_children()
+    }
+}