diff --git a/dlls/dinput/config.c b/dlls/dinput/config.c
index 1c6da6ccf23..9e080f1e845 100644
--- a/dlls/dinput/config.c
+++ b/dlls/dinput/config.c
@@ -16,6 +16,8 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
+#define NONAMELESSUNION
+
 #include "wine/debug.h"
 #include "wine/unicode.h"
 #include "objbase.h"
@@ -141,7 +143,7 @@ static void lv_set_action(HWND dialog, int item, int action, LPDIACTIONFORMATW l
     if (item < 0) return;
 
     if (action != -1)
-        action_text = lpdiaf->rgoAction[action].lptszActionName;
+        action_text = lpdiaf->rgoAction[action].u.lptszActionName;
 
     /* Keep the action and text in the listview item */
     lvItem.iItem = item;
@@ -282,7 +284,7 @@ static void show_suitable_actions(HWND dialog)
         /* Add action string and index in the action format to the list entry */
         if (DIDFT_GETINSTANCE(lpdiaf->rgoAction[i].dwSemantic) & DIDFT_GETTYPE(device->ddo[obj].dwType))
         {
-            SendDlgItemMessageW(dialog, IDC_ACTIONLIST, LB_ADDSTRING, 0, (LPARAM)lpdiaf->rgoAction[i].lptszActionName);
+            SendDlgItemMessageW(dialog, IDC_ACTIONLIST, LB_ADDSTRING, 0, (LPARAM)lpdiaf->rgoAction[i].u.lptszActionName);
             SendDlgItemMessageW(dialog, IDC_ACTIONLIST, LB_SETITEMDATA, added, (LPARAM) i);
             added++;
         }
@@ -337,7 +339,7 @@ static void copy_actions(LPDIACTIONFORMATW to, LPDIACTIONFORMATW from)
         to->rgoAction[i].guidInstance = from->rgoAction[i].guidInstance;
         to->rgoAction[i].dwObjID = from->rgoAction[i].dwObjID;
         to->rgoAction[i].dwHow = from->rgoAction[i].dwHow;
-        to->rgoAction[i].lptszActionName = from->rgoAction[i].lptszActionName;
+        to->rgoAction[i].u.lptszActionName = from->rgoAction[i].u.lptszActionName;
     }
 }