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-rw-r--r--components/script/dom/canvasrenderingcontext2d.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/components/script/dom/canvasrenderingcontext2d.rs b/components/script/dom/canvasrenderingcontext2d.rs
index 6b3f898123f..6297a0718d8 100644
--- a/components/script/dom/canvasrenderingcontext2d.rs
+++ b/components/script/dom/canvasrenderingcontext2d.rs
@@ -17,6 +17,7 @@ use geom::size::Size2D;
use canvas::canvas_render_task::{CanvasMsg, CanvasRenderTask, ClearRect, Close, FillRect, Recreate, StrokeRect};
#[deriving(Encodable)]
+#[must_root]
pub struct CanvasRenderingContext2D {
reflector_: Reflector,
global: GlobalField,