diff --git a/pvAccessApp/utils/inetAddressUtil.cpp b/pvAccessApp/utils/inetAddressUtil.cpp
index 18e1d18..255b772 100644
--- a/pvAccessApp/utils/inetAddressUtil.cpp
+++ b/pvAccessApp/utils/inetAddressUtil.cpp
@@ -91,7 +91,7 @@ namespace epics {
                 if(!(*pifreq->ifr_name)) break;
 
                 if(i>0) {
-                    size_t n = pifreq->ifr_addr.sa_len+sizeof(pifreq->ifr_name);
+                    size_t n = sizeof(sockaddr)+sizeof(pifreq->ifr_name);
                     if(n<sizeof(ifreq))
                         pifreq++;
                     else