diff --git a/src/Uno.UI.RuntimeTests/Tests/Uno_UI_Toolkit/Given_RuntimePlatformDetected.cs b/src/Uno.UI.RuntimeTests/Tests/Uno_UI_Toolkit/Given_RuntimePlatformDetected.cs
index 8914fdcf1377..94bb843201d3 100644
--- a/src/Uno.UI.RuntimeTests/Tests/Uno_UI_Toolkit/Given_RuntimePlatformDetected.cs
+++ b/src/Uno.UI.RuntimeTests/Tests/Uno_UI_Toolkit/Given_RuntimePlatformDetected.cs
@@ -56,14 +56,6 @@ public void When_IsMacCatalyst()
 		}
 #endif
 
-#if __MACOS__
-		[TestMethod]
-		public void When_IsMacOS()
-		{
-			Uno.UI.Helpers.PlatformRuntimeHelper.Current.IsMacOS().Should().BeTrue();
-		}
-#endif
-
 #if __WASM__
 		[TestMethod]
 		public void When_IsWebAssembly()
@@ -78,6 +70,12 @@ public void When_IsWindows()
 		{
 			Uno.UI.Toolkit.PlatformRuntimeHelper.Current.Should().Be(Uno.UI.Toolkit.UnoRuntimePlatform.Windows);
 		}
+#else
+		[TestMethod]
+		public void When_IsUnoIsKnown()
+		{
+			Uno.UI.Helpers.PlatformRuntimeHelper.Current.Should().NotBe(Uno.UI.Toolkit.UnoRuntimePlatform.Unknown);
+		}
 #endif
 	}
 }
diff --git a/src/Uno.UI.Toolkit/UnoRuntimePlatform.cs b/src/Uno.UI.Toolkit/UnoRuntimePlatform.cs
index 82827480a921..0a0b3158043a 100644
--- a/src/Uno.UI.Toolkit/UnoRuntimePlatform.cs
+++ b/src/Uno.UI.Toolkit/UnoRuntimePlatform.cs
@@ -6,7 +6,6 @@ public enum UnoRuntimePlatform
 	Android,
 	iOS,
 	MacCatalyst,
-	MacOSX,
 	WebAssembly,
 	Windows,
 	SkiaGtk,
diff --git a/src/Uno.UI/Helpers/PlatformRuntimeHelper.cs b/src/Uno.UI/Helpers/PlatformRuntimeHelper.cs
index a6b32584faf3..2a0ac2555493 100644
--- a/src/Uno.UI/Helpers/PlatformRuntimeHelper.cs
+++ b/src/Uno.UI/Helpers/PlatformRuntimeHelper.cs
@@ -19,8 +19,6 @@ private static UnoRuntimePlatform GetPlatform() =>
 		UnoRuntimePlatform.iOS;
 #elif __MACCATALYST__
 		UnoRuntimePlatform.MacCatalyst;
-#elif __MACOS__
-		UnoRuntimePlatform.MacOSX;
 #elif __WASM__
 		UnoRuntimePlatform.WebAssembly;
 #elif __SKIA__
diff --git a/src/Uno.UI/Helpers/UnoRuntimePlatform.cs b/src/Uno.UI/Helpers/UnoRuntimePlatform.cs
index e6eac495bb36..0d29c868a370 100644
--- a/src/Uno.UI/Helpers/UnoRuntimePlatform.cs
+++ b/src/Uno.UI/Helpers/UnoRuntimePlatform.cs
@@ -12,7 +12,6 @@ public enum UnoRuntimePlatform
 	Android,
 	iOS,
 	MacCatalyst,
-	MacOSX,
 	WebAssembly,
 	Windows,
 	SkiaGtk,
diff --git a/src/Uno.UI/Helpers/Xaml/UnoRuntimePlatformExtensions.cs b/src/Uno.UI/Helpers/Xaml/UnoRuntimePlatformExtensions.cs
index 76ebb14e666f..d3f02b73022f 100644
--- a/src/Uno.UI/Helpers/Xaml/UnoRuntimePlatformExtensions.cs
+++ b/src/Uno.UI/Helpers/Xaml/UnoRuntimePlatformExtensions.cs
@@ -12,8 +12,6 @@ public static bool IsSkia(this UnoRuntimePlatform platform) => platform == UnoRu
 
 	public static bool IsMacCatalyst(this UnoRuntimePlatform platform) => platform == UnoRuntimePlatform.MacCatalyst;
 
-	public static bool IsMacOS(this UnoRuntimePlatform platform) => platform == UnoRuntimePlatform.MacOSX;
-
 	public static bool IsWebAssembly(this UnoRuntimePlatform platform) => platform == UnoRuntimePlatform.WebAssembly;
 
 	public static bool IsWindows(this UnoRuntimePlatform platform) => platform == UnoRuntimePlatform.Windows;