diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/NullableTests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/NullableTests.cs
index c3888c8dc96757..07b77ee4e9545f 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/NullableTests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/NullableTests.cs
@@ -174,6 +174,7 @@ public class SimpleClassWithDictionariesWithNullableValues
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/79583", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public static void ClassWithDictionariesWithNullableValues()
         {
             string json =