diff --git a/plugins/text-editor-resources/src/components/extension/codeblock.ts b/plugins/text-editor-resources/src/components/extension/codeblock.ts
index 43d3c8dc0a..e7fb284c08 100644
--- a/plugins/text-editor-resources/src/components/extension/codeblock.ts
+++ b/plugins/text-editor-resources/src/components/extension/codeblock.ts
@@ -134,7 +134,7 @@ function createDecorations (doc: ProseMirrorNode, options: CodeBlockLowlightOpti
   doc.descendants((node, pos) => {
     if (node.type.name === CodeBlockLowlight.name) {
       decorations.push(
-        Decoration.widget(pos + node.nodeSize - 1, (view) => {
+        Decoration.widget(pos + 1, (view) => {
           const button = createLangButton(node.attrs.language)
 
           if (view.editable) {