diff --git a/src/Browser/Avalonia.Browser/Interop/DomHelper.cs b/src/Browser/Avalonia.Browser/Interop/DomHelper.cs
index 9ee96768ec..d1133b8916 100644
--- a/src/Browser/Avalonia.Browser/Interop/DomHelper.cs
+++ b/src/Browser/Avalonia.Browser/Interop/DomHelper.cs
@@ -29,5 +29,5 @@ internal static partial class DomHelper
     [JSImport("AvaloniaDOM.observeDarkMode", AvaloniaModule.MainModuleName)]
     public static partial JSObject ObserveDarkMode(
         [JSMarshalAs<JSType.Function<JSType.Boolean, JSType.Boolean>>]
-        Action<bool, bool> onDpiChanged);
+        Action<bool, bool> observer);
 }