diff --git a/dom/canvas/CanvasRenderingContext2D.cpp b/dom/canvas/CanvasRenderingContext2D.cpp
index 44b78f54368..3eb5c61ffba 100644
--- a/dom/canvas/CanvasRenderingContext2D.cpp
+++ b/dom/canvas/CanvasRenderingContext2D.cpp
@@ -2980,6 +2980,9 @@ void CanvasRenderingContext2D::SetFilter(const nsACString& aFilter,
     CurrentState().filterString = aFilter;
     CurrentState().filterChain = std::move(filterChain);
     if (mCanvasElement) {
+      if (CurrentState().autoSVGFiltersObserver) {
+        CurrentState().autoSVGFiltersObserver->Detach();
+      }
       CurrentState().autoSVGFiltersObserver =
           SVGObserverUtils::ObserveFiltersForCanvasContext(
               this, mCanvasElement, CurrentState().filterChain.AsSpan());