diff --git a/include/vkd3d_vk_includes.h b/include/vkd3d_vk_includes.h
index 11c061503c..aa7ed0d9f5 100644
--- a/include/vkd3d_vk_includes.h
+++ b/include/vkd3d_vk_includes.h
@@ -40,6 +40,7 @@ typedef enum VkImageLayout VkImageLayout;
 
 typedef enum D3D12_VK_EXTENSION
 {
+    D3D12_VK_EXT_OPACITY_MICROMAP   = 0x0,
     D3D12_VK_NVX_BINARY_IMPORT      = 0x1,
     D3D12_VK_NVX_IMAGE_VIEW_HANDLE  = 0x2,
     D3D12_VK_NV_LOW_LATENCY_2       = 0x3
diff --git a/libs/vkd3d/device_vkd3d_ext.c b/libs/vkd3d/device_vkd3d_ext.c
index a8c07fe170..8f0c65cef7 100644
--- a/libs/vkd3d/device_vkd3d_ext.c
+++ b/libs/vkd3d/device_vkd3d_ext.c
@@ -69,6 +69,9 @@ static BOOL STDMETHODCALLTYPE d3d12_device_vkd3d_ext_GetExtensionSupport(d3d12_d
     TRACE("iface %p, extension %u \n", iface, extension);
     switch (extension)
     {
+        case D3D12_VK_EXT_OPACITY_MICROMAP:
+            ret_val = device->vk_info.EXT_opacity_micromap;
+            break;
         case D3D12_VK_NVX_BINARY_IMPORT:
             ret_val = device->vk_info.NVX_binary_import;
             break;