diff --git a/libs/client/UserIdentity.hpp b/libs/client/UserIdentity.hpp
index f79d571a74d4009442d30cc90ca98bab06e30f31..77e75daadaa1e5ebbb5bf32e1ad0d1a12a2659e7 100644
--- a/libs/client/UserIdentity.hpp
+++ b/libs/client/UserIdentity.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <stdint.h>
+#include <string>
 
 namespace cta {
 
@@ -19,6 +20,11 @@ struct UserIdentity {
    */
   uint32_t gid;
 
+  /**
+   * The host from which the user is communicating.
+   */
+  std::string host;
+
   /**
    * Constructor.
    *