diff --git a/ts/editable/mathjax-component.ts b/ts/editable/mathjax-component.ts
index 5fecdf69a..2be18fec6 100644
--- a/ts/editable/mathjax-component.ts
+++ b/ts/editable/mathjax-component.ts
@@ -61,7 +61,7 @@ function moveNodesInsertedOutside(element: Element, allowedChild: Node): () => v
         }
     });
 
-    observer.observe(element, { characterData: true, subtree: true });
+    observer.observe(element, { childList: true, characterData: true });
     return () => observer.disconnect();
 }