diff --git a/src/network/kernel/qnetworkinterface_unix.cpp b/src/network/kernel/qnetworkinterface_unix.cpp
index 541c78d838e..dca9aa2c937 100644
--- a/src/network/kernel/qnetworkinterface_unix.cpp
+++ b/src/network/kernel/qnetworkinterface_unix.cpp
@@ -231,7 +231,11 @@ static QNetworkInterfacePrivate *findInterface(int socket, QList<QNetworkInterfa
     // Get the interface index
 #  ifdef SIOCGIFINDEX
     if (qt_safe_ioctl(socket, SIOCGIFINDEX, &req) >= 0)
+#    if defined(Q_OS_HAIKU)
+        ifindex = req.ifr_index;
+#    else
         ifindex = req.ifr_ifindex;
+#    endif
 #  else
     ifindex = if_nametoindex(req.ifr_name);
 #  endif