diff --git a/src/network/kernel/qdnslookup_unix.cpp b/src/network/kernel/qdnslookup_unix.cpp
index 05e0663aeff..bb1c4feb953 100644
--- a/src/network/kernel/qdnslookup_unix.cpp
+++ b/src/network/kernel/qdnslookup_unix.cpp
@@ -107,6 +107,7 @@ void QDnsLookupRunnable::query(const int requestType, const QByteArray &requestN
         reply->errorString = tr("Server could not process query");
         return;
     case SERVFAIL:
+    case NOTIMP:
         reply->error = QDnsLookup::ServerFailureError;
         reply->errorString = tr("Server failure");
         return;
diff --git a/src/network/kernel/qdnslookup_win.cpp b/src/network/kernel/qdnslookup_win.cpp
index 564966e3955..796ff9c2061 100644
--- a/src/network/kernel/qdnslookup_win.cpp
+++ b/src/network/kernel/qdnslookup_win.cpp
@@ -44,6 +44,7 @@ void QDnsLookupRunnable::query(const int requestType, const QByteArray &requestN
         reply->errorString = tr("Server could not process query");
         return;
     case DNS_ERROR_RCODE_SERVER_FAILURE:
+    case DNS_ERROR_RCODE_NOT_IMPLEMENTED:
         reply->error = QDnsLookup::ServerFailureError;
         reply->errorString = tr("Server failure");
         return;