diff --git a/core/bubbles/text_bubble.ts b/core/bubbles/text_bubble.ts
index 020ab4f2e..492bced13 100644
--- a/core/bubbles/text_bubble.ts
+++ b/core/bubbles/text_bubble.ts
@@ -27,6 +27,7 @@ export class TextBubble extends Bubble {
     super(workspace, anchor, ownerRect);
     this.paragraph = this.stringToSvg(text, this.contentContainer);
     this.updateBubbleSize();
+    dom.addClass(this.svgRoot, 'blocklyTextBubble');
   }
 
   /** @returns the current text of this text bubble. */