diff --git a/src/libraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/InlinedTypes.cs b/src/libraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/InlinedTypes.cs
index cb55e36b32cb9..ef2fe4f6d650c 100644
--- a/src/libraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/InlinedTypes.cs
+++ b/src/libraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/InlinedTypes.cs
@@ -53,7 +53,7 @@ static BlockSyntax Body()
                                         GenericName(
                                             Identifier("GetInstance"),
                                             TypeArgumentList(
-                                                SeparatedList<SyntaxNode>(
+                                                SeparatedList<TypeSyntax>(
                                                     new[] { PredefinedType(Token(SyntaxKind.ObjectKeyword)) })))))
                                 .AddArgumentListArguments(
                                     Argument(