diff --git a/azmq/socket.hpp b/azmq/socket.hpp
index 9859078..533c1ef 100644
--- a/azmq/socket.hpp
+++ b/azmq/socket.hpp
@@ -69,6 +69,7 @@ class socket :
     using router_handover = opt::boolean<ZMQ_ROUTER_HANDOVER>;
     using probe_router = opt::boolean<ZMQ_PROBE_ROUTER>;
     using xpub_verbose = opt::boolean<ZMQ_XPUB_VERBOSE>;
+    using xpub_nodrop = opt::integer<ZMQ_XPUB_NODROP>;
     using req_correlate = opt::boolean<ZMQ_REQ_CORRELATE>;
     using req_relaxed = opt::boolean<ZMQ_REQ_RELAXED>;
     using last_endpoint = opt::binary<ZMQ_LAST_ENDPOINT>;