diff --git a/include/vkd3d_d3d12.idl b/include/vkd3d_d3d12.idl
index 3cefd1fd..ec78c665 100644
--- a/include/vkd3d_d3d12.idl
+++ b/include/vkd3d_d3d12.idl
@@ -1547,6 +1547,7 @@ typedef enum D3D12_COMMAND_QUEUE_PRIORITY
 {
     D3D12_COMMAND_QUEUE_PRIORITY_NORMAL = 0,
     D3D12_COMMAND_QUEUE_PRIORITY_HIGH = 100,
+    D3D12_COMMAND_QUEUE_PRIORITY_GLOBAL_REALTIME = 10000,
 } D3D12_COMMAND_QUEUE_PRIORITY;
 
 typedef enum D3D12_COMMAND_QUEUE_FLAGS
diff --git a/libs/vkd3d/command.c b/libs/vkd3d/command.c
index 7b4daa4c..cdccfe8d 100644
--- a/libs/vkd3d/command.c
+++ b/libs/vkd3d/command.c
@@ -5301,6 +5301,12 @@ static HRESULT d3d12_command_queue_init(struct d3d12_command_queue *queue,
     if (!(queue->vkd3d_queue = d3d12_device_get_vkd3d_queue(device, desc->Type)))
         return E_NOTIMPL;
 
+    if (desc->Priority == D3D12_COMMAND_QUEUE_PRIORITY_GLOBAL_REALTIME)
+    {
+        FIXME("Global realtime priority is not implemented.\n");
+        return E_NOTIMPL;
+    }
+
     if (desc->Priority)
         FIXME("Ignoring priority %#x.\n", desc->Priority);
     if (desc->Flags)