diff --git a/assets/js/hooks/cell_editor/live_editor/highlight.js b/assets/js/hooks/cell_editor/live_editor/highlight.js
index 7d1d78f6a..a138593e3 100644
--- a/assets/js/hooks/cell_editor/live_editor/highlight.js
+++ b/assets/js/hooks/cell_editor/live_editor/highlight.js
@@ -24,7 +24,7 @@ export function highlight(code, language) {
     tree,
     getHighlightStyle(),
     (code, classes) => {
-      html += `<span class="${classes}">${code}</span>`;
+      html += `<span class="${classes}">${escapeHtml(code)}</span>`;
     },
     () => {
       html += "<br />";