diff --git a/generation/WinSDK/Partitions/Direct3DDxc/settings.rsp b/generation/WinSDK/Partitions/Direct3DDxc/settings.rsp
index cc2bbf610..6cfc71ed2 100644
--- a/generation/WinSDK/Partitions/Direct3DDxc/settings.rsp
+++ b/generation/WinSDK/Partitions/Direct3DDxc/settings.rsp
@@ -2,3 +2,5 @@
 <IncludeRoot>/um/dxcapi.h
 --namespace
 Windows.Win32.Graphics.Direct3D.Dxc
+--exclude
+CLSID_DxcUtils
diff --git a/generation/WinSDK/manual/Dxc.cs b/generation/WinSDK/manual/Dxc.cs
new file mode 100644
index 000000000..e2dfd8714
--- /dev/null
+++ b/generation/WinSDK/manual/Dxc.cs
@@ -0,0 +1,11 @@
+using System;
+using System.Runtime.InteropServices;
+using Windows.Win32.Foundation.Metadata;
+
+namespace Windows.Win32.Graphics.Direct3D.Dxc
+{
+    public static unsafe partial class Apis
+    {
+        public static readonly Guid CLSID_DxcUtils = new Guid("6245d6af-66e0-48fd-80b4-4d271796748c");
+    }
+}
diff --git a/scripts/ChangesSinceLastRelease.txt b/scripts/ChangesSinceLastRelease.txt
index 7cb8425d7..8fe2490c4 100644
--- a/scripts/ChangesSinceLastRelease.txt
+++ b/scripts/ChangesSinceLastRelease.txt
@@ -556,3 +556,5 @@ Windows.Win32.NetworkManagement.WiFi.Apis.DEVPKEY_PciDevice_UsbComponentRelation
 Windows.Win32.NetworkManagement.WiFi.Apis.DEVPKEY_PciDevice_UsbDvsecPortSpecificAttributes added
 Windows.Win32.NetworkManagement.WiFi.Apis.DEVPKEY_PciDevice_UsbDvsecPortType added
 Windows.Win32.NetworkManagement.WiFi.Apis.DEVPKEY_PciDevice_UsbHostRouterName added
+# Fixed #1812.
+Windows.Win32.Graphics.Direct3D.Dxc.Apis.CLSID_DxcUtils added