diff --git a/samples/unit-tests/svgrenderer/shadows/demo.js b/samples/unit-tests/svgrenderer/shadows/demo.js
index 5c9e03301e3..c78b047e5bf 100644
--- a/samples/unit-tests/svgrenderer/shadows/demo.js
+++ b/samples/unit-tests/svgrenderer/shadows/demo.js
@@ -40,7 +40,7 @@ QUnit.test('Series shadows', function (assert) {
 
     assert.strictEqual(
         chart.series[0].graph.attr('filter'),
-        'url(#drop-shadow-0)',
+        `url(#highcharts-drop-shadow-${chart.index})`,
         'Shadows should be updated when old options defined as object and new as boolean (#12091).'
     );
 
diff --git a/ts/Core/Renderer/SVG/SVGRenderer.ts b/ts/Core/Renderer/SVG/SVGRenderer.ts
index f7472e23f66..bda56990da5 100644
--- a/ts/Core/Renderer/SVG/SVGRenderer.ts
+++ b/ts/Core/Renderer/SVG/SVGRenderer.ts
@@ -601,7 +601,7 @@ class SVGRenderer implements SVGRendererLike {
     ): string {
         const
             id = [
-                `drop-shadow-${this.chartIndex}`,
+                `highcharts-drop-shadow-${this.chartIndex}`,
                 ...Object.keys(shadowOptions)
                     .map((key: string): number|string =>
                         (shadowOptions as any)[key]