diff --git a/apps/web/src/components/ChatMarkdown.tsx b/apps/web/src/components/ChatMarkdown.tsx
index 3b736cae26536a90726c3e4c931bc30bb7c06bfc..a56db444d2005ded7377295078fe8a70423292e2 100644
--- a/apps/web/src/components/ChatMarkdown.tsx
+++ b/apps/web/src/components/ChatMarkdown.tsx
@@ -378,7 +378,7 @@ function findTaskListMarkerOffset(markdown: string, listItemStart: number): numb
  * The default `1.25rem` marker gutter (`.chat-markdown ol`) fits one-character
  * markers. Wider markers can extend past it and get clipped by a collapsed
  * message's overflow. Widen the gutter to fit the widest marker, including a
- * negative marker's minus sign.
+ * negative marker's minus sign, the period, and the trailing space.
  */
 function orderedListGutterStyle(
   itemCount: number,
@@ -389,7 +389,7 @@ function orderedListGutterStyle(
   const lastNumber = firstNumber + Math.max(itemCount - 1, 0);
   const markerWidth = Math.max(String(firstNumber).length, String(lastNumber).length);
   if (markerWidth <= 1) return undefined;
-  return { "--list-gutter": `${markerWidth + 1}ch` };
+  return { "--list-gutter": `${markerWidth + 2}ch` };
 }
 
 type MarkdownImageHastNode = {