diff --git a/gnome-session/gsm-util.c b/gnome-session/gsm-util.c
index 02bc4a5702f3296bfb6d52347b59dc925ba35e69..5a52de572998fb7806abb93cbbbbda02f6ad5e66 100644
--- a/gnome-session/gsm-util.c
+++ b/gnome-session/gsm-util.c
@@ -64,6 +64,7 @@ static const char * const variable_unsetlist[] = {
     "WAYLAND_DISPLAY",
     "WAYLAND_SOCKET",
     "GNOME_SHELL_SESSION_MODE",
+    "GNOME_SETUP_DISPLAY",
     NULL
 };