diff --git a/webmail/webmail.js b/webmail/webmail.js
index 2d507e3..413d2f9 100644
--- a/webmail/webmail.js
+++ b/webmail/webmail.js
@@ -1088,7 +1088,7 @@ const defaultSettings = {
 	mailboxCollapsed: {},
 	showAllHeaders: false,
 	showHeaders: [],
-	threading: api.ThreadMode.ThreadUnread,
+	threading: api.ThreadMode.ThreadOn,
 	checkConsistency: location.hostname === 'localhost', // Enable UI update consistency checks, default only for local development.
 };
 const parseSettings = () => {
diff --git a/webmail/webmail.ts b/webmail/webmail.ts
index ebbdaf4..8759157 100644
--- a/webmail/webmail.ts
+++ b/webmail/webmail.ts
@@ -137,7 +137,7 @@ const defaultSettings = {
 	mailboxCollapsed: {} as {[mailboxID: number]: boolean}, // Mailboxes that are collapsed.
 	showAllHeaders: false, // Whether to show all message headers.
 	showHeaders: [] as string[], // Additional message headers to show.
-	threading: api.ThreadMode.ThreadUnread,
+	threading: api.ThreadMode.ThreadOn,
 	checkConsistency: location.hostname === 'localhost', // Enable UI update consistency checks, default only for local development.
 }
 const parseSettings = (): typeof defaultSettings => {