diff --git a/core/renderers/common/path_object.ts b/core/renderers/common/path_object.ts
index d5c0850a1b8..8ca8cd19324 100644
--- a/core/renderers/common/path_object.ts
+++ b/core/renderers/common/path_object.ts
@@ -186,8 +186,11 @@ export class PathObject implements IPathObject {
    */
   protected updateShadow_(shadow: boolean) {
     if (shadow) {
+      this.setClass_('blocklyShadow', true);
       this.svgPath.setAttribute('stroke', 'none');
       this.svgPath.setAttribute('fill', this.style.colourSecondary);
+    } else {
+      this.setClass_('blocklyShadow', false);
     }
   }