diff --git a/package/utils/ugps/files/ugps.init b/package/utils/ugps/files/ugps.init
index 3cd1ca1b8d..77c3603066 100644
--- a/package/utils/ugps/files/ugps.init
+++ b/package/utils/ugps/files/ugps.init
@@ -16,11 +16,16 @@ start_service() {
 	local disabled="$(uci get gps.@gps[-1].disabled || echo 0)"
 
 	[ "$disabled" == "0" ] || return
+	[ "$tty" ] || return
 
-	[ -c "$tty" ] || {
-		tty="/dev/$tty"
-		[ -c "$tty" ] || return
-	}
+	case "$tty" in
+		"/"*)
+			true
+			;;
+		*)
+			tty="/dev/$tty"
+			;;
+	esac
 
 	procd_open_instance
 	procd_set_param command "$PROG"