diff --git a/.changeset/member-event-days-rounding.md b/.changeset/member-event-days-rounding.md
new file mode 100644
index 0000000000..7481cd0564
--- /dev/null
+++ b/.changeset/member-event-days-rounding.md
@@ -0,0 +1,6 @@
+---
+"adcontextprotocol": patch
+---
+
+Match the 3.1 line's upcoming-event day calculation in member context prompts
+so events exactly five days out do not intermittently render as four days.
diff --git a/server/src/addie/member-context.ts b/server/src/addie/member-context.ts
index 99824b7ac7..0d9f547403 100644
--- a/server/src/addie/member-context.ts
+++ b/server/src/addie/member-context.ts
@@ -1564,7 +1564,7 @@ export function formatMemberContextForPrompt(context: MemberContext, channel: 'w
   // Upcoming registered event — context for time-bound discussions.
   if (context.next_event) {
     const e = context.next_event;
-    const days = Math.floor(
+    const days = Math.round(
       (e.starts_at.getTime() - Date.now()) / (24 * 60 * 60 * 1000)
     );
     lines.push('');