diff --git a/saturn/main.fnl b/saturn/main.fnl
index fe8650f..9707cbd 100644
--- a/saturn/main.fnl
+++ b/saturn/main.fnl
@@ -25,12 +25,17 @@
 
 
 (local DBUS_NAME_FLAG_DO_NOT_QUEUE 4)
+(local DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER 1)
+(local DBUS_REQUEST_NAME_REPLY_IN_QUEUE 2)
+(local DBUS_REQUEST_NAME_REPLY_EXISTS 3)
+(local DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER 4)
+
 (let [ret (bus:RequestName "net.telent.saturn" DBUS_NAME_FLAG_DO_NOT_QUEUE)]
-  (if (or (= ret 1) (= ret 4))
+  (if (or (= ret DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) (= ret DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER))
       true
-      (= ret 2)
+      (= ret DBUS_REQUEST_NAME_REPLY_IN_QUEUE)
       (error "unexpected DBUS_REQUEST_NAME_REPLY_IN_QUEUE")
-      (= ret 3)
+      (= ret DBUS_REQUEST_NAME_REPLY_EXISTS)
       (do
         (print "already running")
         (os.exit 0))))