diff --git a/libLauncher/src/main/java/ru/gravit/launcher/LauncherHWIDInterface.java b/libLauncher/src/main/java/ru/gravit/launcher/LauncherHWIDInterface.java
index 758f8ac0..ffefbf39 100644
--- a/libLauncher/src/main/java/ru/gravit/launcher/LauncherHWIDInterface.java
+++ b/libLauncher/src/main/java/ru/gravit/launcher/LauncherHWIDInterface.java
@@ -1,5 +1,6 @@
 package ru.gravit.launcher;
 
+@FunctionalInterface
 public interface LauncherHWIDInterface {
     HWID getHWID();
 }