diff --git a/shell/browser/api/atom_api_system_preferences_mac.mm b/shell/browser/api/atom_api_system_preferences_mac.mm
index 9508e182caf4d..8cd5f7f19476c 100644
--- a/shell/browser/api/atom_api_system_preferences_mac.mm
+++ b/shell/browser/api/atom_api_system_preferences_mac.mm
@@ -628,6 +628,10 @@ AVMediaType ParseMediaType(const std::string& media_type) {
 }
 
 bool SystemPreferences::IsDarkMode() {
+  if (@available(macOS 10.14, *)) {
+    return [[NSApplication sharedApplication].effectiveAppearance.name
+        isEqualToString:NSAppearanceNameDarkAqua];
+  }
   NSString* mode = [[NSUserDefaults standardUserDefaults]
       stringForKey:@"AppleInterfaceStyle"];
   return [mode isEqualToString:@"Dark"];