diff --git a/src/System.Runtime.Extensions/tests/System/MathTests.netcoreapp.cs b/src/System.Runtime.Extensions/tests/System/MathTests.netcoreapp.cs
index 2439880d91aa..f1792140768d 100644
--- a/src/System.Runtime.Extensions/tests/System/MathTests.netcoreapp.cs
+++ b/src/System.Runtime.Extensions/tests/System/MathTests.netcoreapp.cs
@@ -7,6 +7,7 @@
 
 namespace System.Tests
 {
+    [SkipOnTargetFramework(TargetFrameworkMonikers.UapAot, "Math.Clamp is not in CoreRT yet.")]
     public static partial class MathTests
     {
         public static IEnumerable<object[]> Clamp_UnsignedInt_TestData()