diff --git a/docs/walkthroughs/03-defining-custom-elements.md b/docs/walkthroughs/03-defining-custom-elements.md
index 1adbafa76..cfbbf7a53 100644
--- a/docs/walkthroughs/03-defining-custom-elements.md
+++ b/docs/walkthroughs/03-defining-custom-elements.md
@@ -120,7 +120,7 @@ Okay, but now we'll need a way for the user to actually turn a block into a code
 
 ```jsx
 // Import the `Editor` and `Transforms` helpers from Slate.
-import { Editor, Transforms } from 'slate'
+import { Editor, Transforms, Element } from 'slate'
 
 const initialValue = [
   {