diff --git a/code/cgame/cg_ui.cpp b/code/cgame/cg_ui.cpp
new file mode 100644
index 00000000..ae83099e
--- /dev/null
+++ b/code/cgame/cg_ui.cpp
@@ -0,0 +1,32 @@
+/*
+===========================================================================
+Copyright (C) 2023 the OpenMoHAA team
+
+This file is part of OpenMoHAA source code.
+
+OpenMoHAA source code is free software; you can redistribute it
+and/or modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation; either version 2 of the License,
+or (at your option) any later version.
+
+OpenMoHAA source code is distributed in the hope that it will be
+useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with OpenMoHAA source code; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+===========================================================================
+*/
+
+// DESCRIPTION:
+// UI features
+
+#include "cg_local.h"
+
+int CG_CheckCaptureKey(int key, qboolean down, unsigned int time)
+{
+    // FIXME: unimplemented
+    return 0;
+}