diff --git a/src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Tests/RcwAroundCcwTests.cs b/src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Tests/RcwAroundCcwTests.cs
index 50502007504cc8de8bd3e72658677fe3bc3e365f..89ec569e35435a29f0625bf1679e495c9f34927e 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Tests/RcwAroundCcwTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Tests/RcwAroundCcwTests.cs
@@ -213,6 +213,7 @@ public void StatefulMarshalling()
             Assert.Equal(1, obj.ReturnPreserveSig().i);
         }
 
+        [Fact]
         public void ICollectionMarshallingFails()
         {
             Type hrExceptionType = SystemFindsComCalleeException() ? typeof(MarshallingFailureException) : typeof(Exception);