diff --git a/Mac/MainWindow/Sidebar/UnreadCountView.swift b/Mac/MainWindow/Sidebar/UnreadCountView.swift
index ddf9aeb17..a64f8d0b7 100644
--- a/Mac/MainWindow/Sidebar/UnreadCountView.swift
+++ b/Mac/MainWindow/Sidebar/UnreadCountView.swift
@@ -10,7 +10,7 @@ import AppKit
 
 @MainActor final class UnreadCountView : NSView {
 
-	struct Appearance {
+	@MainActor struct Appearance {
 		static let padding = NSEdgeInsets(top: 1.0, left: 7.0, bottom: 1.0, right: 7.0)
 		static let cornerRadius: CGFloat = 8.0
 		static let backgroundColor = NSColor(named: "SidebarUnreadCountBackground")!