diff --git a/dlls/winex11.drv/window.c b/dlls/winex11.drv/window.c
index 0c1738c26c6..98772f3d44e 100644
--- a/dlls/winex11.drv/window.c
+++ b/dlls/winex11.drv/window.c
@@ -2474,6 +2474,7 @@ BOOL X11DRV_SystrayDockInsert( HWND hwnd, UINT cx, UINT cy, void *icon )
     window = data->whole_window;
     release_win_data( data );
 
+    NtUserSetWindowPos( hwnd, NULL, 0, 0, 0, 0, SWP_NOSIZE|SWP_NOZORDER );
     NtUserShowWindow( hwnd, SW_SHOWNA );
 
     TRACE_(systray)( "icon window %p/%lx\n", hwnd, window );