diff --git a/src/ncsi_util.hpp b/src/ncsi_util.hpp
index 27397c8..4235429 100644
--- a/src/ncsi_util.hpp
+++ b/src/ncsi_util.hpp
@@ -165,6 +165,8 @@
     int sd;
     int net;
     uint8_t eid;
+
+    std::optional<uint8_t> allocateIID();
 };
 
 } // namespace ncsi