diff --git a/wadsrc/static/menudef.txt b/wadsrc/static/menudef.txt
index f19c4ccea..74bd80c8a 100644
--- a/wadsrc/static/menudef.txt
+++ b/wadsrc/static/menudef.txt
@@ -1034,6 +1034,7 @@ OptionMenu "VideoOptions" protected
 	Option "$DSPLYMNU_VOXELS",					"r_voxels",					"OnOff"
 	Option "$DSPLYMNU_SHADOWS",					"r_shadows",					"OnOff"
 	Option "$DSPLYMNU_SLOPETILT",				"cl_slopetilting",					"OnOff"
+	Option "$GLPREFMNU_ENVIRONMENTMAPMIRROR",	gl_mirror_envmap,				"OnOff"
 	ifnotgame(Blood, Exhumed)
 	{
 		Option "$DSPLYMNU_VIEWBOB",					"cl_viewbob",					"OnOff"