diff --git a/core/block_svg.ts b/core/block_svg.ts
index a289db556..7bdbd5b79 100644
--- a/core/block_svg.ts
+++ b/core/block_svg.ts
@@ -1079,6 +1079,20 @@ export class BlockSvg
     }
   }
 
+  /**
+   * Add blocklyNotDeletable class when block is not deletable
+   * Or remove class when block is deletable
+   */
+  override setDeletable(deletable: boolean) {
+    super.setDeletable(deletable);
+
+    if (deletable) {
+      dom.removeClass(this.svgGroup_, 'blocklyNotDeletable');
+    } else {
+      dom.addClass(this.svgGroup_, 'blocklyNotDeletable');
+    }
+  }
+
   /**
    * Set whether the block is highlighted or not.  Block highlighting is
    * often used to visually mark blocks currently being executed.