diff --git a/src/libraries/System.Runtime.InteropServices/gen/Microsoft.Interop.SourceGeneration/MarshallingAttributeInfo.cs b/src/libraries/System.Runtime.InteropServices/gen/Microsoft.Interop.SourceGeneration/MarshallingAttributeInfo.cs
index e6bf24e3d5d24..675a37230a1bd 100644
--- a/src/libraries/System.Runtime.InteropServices/gen/Microsoft.Interop.SourceGeneration/MarshallingAttributeInfo.cs
+++ b/src/libraries/System.Runtime.InteropServices/gen/Microsoft.Interop.SourceGeneration/MarshallingAttributeInfo.cs
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
 using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
@@ -159,7 +160,7 @@ internal static MarshallingInfo CreateSpecificMarshallingInfo(ManagedTypeInfo un
                 SpecialTypeInfo(_, _, SpecialType.System_UInt32) => CreateWellKnownComExceptionMarshallingData($"{TypeNames.ExceptionHResultMarshaller}<uint>", unmanagedReturnType),
                 SpecialTypeInfo(_, _, SpecialType.System_Single) => CreateWellKnownComExceptionMarshallingData($"{TypeNames.ExceptionNaNMarshaller}<float>", unmanagedReturnType),
                 SpecialTypeInfo(_, _, SpecialType.System_Double) => CreateWellKnownComExceptionMarshallingData($"{TypeNames.ExceptionNaNMarshaller}<double>", unmanagedReturnType),
-                _ => CreateWellKnownComExceptionMarshallingData($"{TypeNames.ExceptionDefaultMarshaller}<{unmanagedReturnType.FullTypeName}>", unmanagedReturnType),
+                _ => CreateWellKnownComExceptionMarshallingData($"{TypeNames.ExceptionDefaultMarshaller}<{MarshallerHelpers.GetCompatibleGenericTypeParameterSyntax(SyntaxFactory.ParseTypeName(unmanagedReturnType.FullTypeName))}>", unmanagedReturnType),
             };
 
             static NativeMarshallingAttributeInfo CreateWellKnownComExceptionMarshallingData(string marshallerName, ManagedTypeInfo unmanagedType)