diff --git a/server/XfrmController.cpp b/server/XfrmController.cpp
index e2cef00..f1e0e23 100644
--- a/server/XfrmController.cpp
+++ b/server/XfrmController.cpp
@@ -209,7 +209,7 @@
         };
 
         iov[0].iov_base = &nlMsg;
-        iov[0].iov_len = sizeof(nlMsg);
+        iov[0].iov_len = NLMSG_HDRLEN;
         for (int i = 0; i < iovLen; ++i) {
             nlMsg.nlmsg_len += iov[i].iov_len;
         }