diff --git a/dlls/winex11.drv/event.c b/dlls/winex11.drv/event.c
index 9a489cd2980..542fce892eb 100644
--- a/dlls/winex11.drv/event.c
+++ b/dlls/winex11.drv/event.c
@@ -511,6 +511,7 @@ static void handle_wm_protocols( HWND hwnd, XClientMessageEvent *event )
         if (IsWindowEnabled(hwnd))
         {
             HMENU hSysMenu;
+            POINT pt;
 
             if (GetClassLongW(hwnd, GCL_STYLE) & CS_NOCLOSE) return;
             hSysMenu = GetSystemMenu(hwnd, FALSE);
@@ -524,7 +525,7 @@ static void handle_wm_protocols( HWND hwnd, XClientMessageEvent *event )
             {
                 LRESULT ma = SendMessageW( hwnd, WM_MOUSEACTIVATE,
                                            (WPARAM)GetAncestor( hwnd, GA_ROOT ),
-                                           MAKELONG(HTCLOSE,WM_LBUTTONDOWN) );
+                                           MAKELPARAM( HTCLOSE, WM_NCLBUTTONDOWN ) );
                 switch(ma)
                 {
                     case MA_NOACTIVATEANDEAT:
@@ -541,7 +542,10 @@ static void handle_wm_protocols( HWND hwnd, XClientMessageEvent *event )
                         break;
                 }
             }
-            PostMessageW( hwnd, WM_X11DRV_DELETE_WINDOW, 0, 0 );
+            /* Simulate clicking the caption Close button */
+            GetCursorPos( &pt );
+            PostMessageW( hwnd, WM_NCLBUTTONDOWN, HTCLOSE, MAKELPARAM( pt.x, pt.y ) );
+            PostMessageW( hwnd, WM_LBUTTONUP, HTCLOSE, MAKELPARAM( pt.x, pt.y ) );
         }
     }
     else if (protocol == x11drv_atom(WM_TAKE_FOCUS))
diff --git a/dlls/winex11.drv/window.c b/dlls/winex11.drv/window.c
index 19551fa2c9c..4bbd5def53e 100644
--- a/dlls/winex11.drv/window.c
+++ b/dlls/winex11.drv/window.c
@@ -2308,8 +2308,6 @@ LRESULT CDECL X11DRV_WindowMessage( HWND hwnd, UINT msg, WPARAM wp, LPARAM lp )
     {
     case WM_X11DRV_ACQUIRE_SELECTION:
         return X11DRV_AcquireClipboard( hwnd );
-    case WM_X11DRV_DELETE_WINDOW:
-        return SendMessageW( hwnd, WM_SYSCOMMAND, SC_CLOSE, 0 );
     case WM_X11DRV_SET_WIN_FORMAT:
         return set_win_format( hwnd, (XID)wp );
     case WM_X11DRV_SET_WIN_REGION:
diff --git a/dlls/winex11.drv/x11drv.h b/dlls/winex11.drv/x11drv.h
index 404be341048..eb84089a77e 100644
--- a/dlls/winex11.drv/x11drv.h
+++ b/dlls/winex11.drv/x11drv.h
@@ -700,7 +700,6 @@ extern DWORD EVENT_x11_time_to_win32_time(Time time);
 enum x11drv_window_messages
 {
     WM_X11DRV_ACQUIRE_SELECTION = 0x80001000,
-    WM_X11DRV_DELETE_WINDOW,
     WM_X11DRV_SET_WIN_FORMAT,
     WM_X11DRV_SET_WIN_REGION,
     WM_X11DRV_RESIZE_DESKTOP