diff --git a/contrib/systemd/xdg-desktop-portal-wlr.service.in b/contrib/systemd/xdg-desktop-portal-wlr.service.in
index ed9fddc..29a03f4 100644
--- a/contrib/systemd/xdg-desktop-portal-wlr.service.in
+++ b/contrib/systemd/xdg-desktop-portal-wlr.service.in
@@ -2,6 +2,7 @@
 Description=Portal service (wlroots implementation)
 PartOf=graphical-session.target
 After=graphical-session.target
+ConditionEnvironment=WAYLAND_DISPLAY
 
 [Service]
 Type=dbus