diff --git a/debian/flatpak.postinst b/debian/flatpak.postinst
index 822c5d4..84e6a03 100755
--- a/debian/flatpak.postinst
+++ b/debian/flatpak.postinst
@@ -18,6 +18,16 @@ if [ "$1" = configure ]; then
     # Run a do-nothing command (it just lists configured remotes) for
     # its side-effect of initializing the shared system-wide repository.
     flatpak remote-list --system >/dev/null || :
+
+    # Enable rewrite-launchers user service on first install only,
+    # if it has not been enabled before.
+    if [ -z "${DPKG_ROOT:-}" ] ; then
+		deb-systemd-helper --user unmask 'xdg-desktop-portal-rewrite-launchers.service' >/dev/null || true
+		# was-enabled defaults to true, so new installations run enable.
+		if deb-systemd-helper --quiet --user was-enabled 'xdg-desktop-portal-rewrite-launchers.service' ; then
+			deb-systemd-helper --user enable 'xdg-desktop-portal-rewrite-launchers.service' >/dev/null || true
+		fi
+	fi
 fi
 
 exit 0