diff --git a/Sources/XiEditor/EditViewController.swift b/Sources/XiEditor/EditViewController.swift
index cf0b0715..57655d7f 100644
--- a/Sources/XiEditor/EditViewController.swift
+++ b/Sources/XiEditor/EditViewController.swift
@@ -212,7 +212,12 @@ class EditViewController: NSViewController, EditViewDataSource, FindDelegate, Sc
                 findViewController.updateColor(newBackgroundColor: self.theme.background, unifiedTitlebar: unifiedTitlebar)
 
                 if color.isDark && unifiedTitlebar {
-                    window.appearance = NSAppearance(named: .vibrantDark)
+                    if #available(OSX 10.14, *) {
+                        window.appearance = NSAppearance(named: .darkAqua)
+                    } else {
+                        // Fallback on earlier versions
+                        window.appearance = NSAppearance(named: .vibrantDark)
+                    }
                 } else {
                     window.appearance = NSAppearance(named: .aqua)
                 }