diff --git a/src/scratch_comment_bubble.ts b/src/scratch_comment_bubble.ts
index e3e185bde9..ec39234630 100644
--- a/src/scratch_comment_bubble.ts
+++ b/src/scratch_comment_bubble.ts
@@ -32,6 +32,7 @@ export class ScratchCommentBubble
       "style",
       `--colour-commentBorder: ${sourceBlock.getColourTertiary()};`
     );
+    this.getSvgRoot().setAttribute("id", this.id);
 
     Blockly.browserEvents.conditionalBind(
       this.getSvgRoot(),