diff --git a/daemon/gdm-wayland-session.c b/daemon/gdm-wayland-session.c
index b648e9de..eee31724 100644
--- a/daemon/gdm-wayland-session.c
+++ b/daemon/gdm-wayland-session.c
@@ -285,6 +285,7 @@ spawn_session (State        *state,
                                                     "WAYLAND_DISPLAY",
                                                     "WAYLAND_SOCKET",
                                                     "GNOME_SHELL_SESSION_MODE",
+                                                    "SLE_CLASSIC_MODE",
                                                     NULL };
 
         g_debug ("Running wayland session");
diff --git a/daemon/gdm-x-session.c b/daemon/gdm-x-session.c
index 88fe96f4..c60ae04f 100644
--- a/daemon/gdm-x-session.c
+++ b/daemon/gdm-x-session.c
@@ -610,6 +610,7 @@ spawn_session (State        *state,
                                                      "WAYLAND_DISPLAY",
                                                      "WAYLAND_SOCKET",
                                                      "GNOME_SHELL_SESSION_MODE",
+                                                     "SLE_CLASSIC_MODE",
                                                      NULL };
 
         g_debug ("Running X session");