diff --git a/src/libraries/System.Text.Json/tests/Common/JsonSchemaExporterTests.cs b/src/libraries/System.Text.Json/tests/Common/JsonSchemaExporterTests.cs
index 6dcdd1e89edd5..f1226dc862e02 100644
--- a/src/libraries/System.Text.Json/tests/Common/JsonSchemaExporterTests.cs
+++ b/src/libraries/System.Text.Json/tests/Common/JsonSchemaExporterTests.cs
@@ -26,6 +26,7 @@ protected JsonSchemaExporterTests(JsonSerializerWrapper serializer) : base(seria
 
         [Theory]
         [MemberData(nameof(GetTestData))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/103694", TestRuntimes.Mono)]
         public void TestTypes_GeneratesExpectedJsonSchema(ITestData testData)
         {
             JsonNode schema = Serializer.DefaultOptions.GetJsonSchemaAsNode(testData.Type, testData.Options);