diff --git a/src/gui/IPv6Dialog.cpp b/src/gui/IPv6Dialog.cpp
index 2af611023..62e2a1159 100644
--- a/src/gui/IPv6Dialog.cpp
+++ b/src/gui/IPv6Dialog.cpp
@@ -116,7 +116,8 @@ void IPv6Dialog::loadFWObject(FWObject *o)
     try
     {
         if ( Interface::isA( obj->getParent() ) )
-            m_dialog->netmask->setText(s->getNetmaskPtr()->toString().c_str());
+            m_dialog->netmask->setText( QString("%1").arg(
+                                            s->getNetmaskPtr()->getLength()) );
     } catch (FWException &ex) {}
 
     //apply->setEnabled( false );
@@ -214,8 +215,7 @@ void IPv6Dialog::applyChanges()
     {
         try
         {
-            s->setNetmask(
-                Inet6Addr(m_dialog->netmask->text().toLatin1().constData()) );
+            s->setNetmask(Inet6Addr(m_dialog->netmask->text().toShort()) );
         } catch (FWException &ex) { }
     } else
         s->setNetmask(Inet6Addr());
diff --git a/src/gui/NetworkDialogIPv6.cpp b/src/gui/NetworkDialogIPv6.cpp
index 08d222f70..f74a9d33d 100644
--- a/src/gui/NetworkDialogIPv6.cpp
+++ b/src/gui/NetworkDialogIPv6.cpp
@@ -166,7 +166,7 @@ void NetworkDialogIPv6::applyChanges()
         s->setAddress(
             Inet6Addr(m_dialog->address->text().toLatin1().constData()) );
         s->setNetmask(
-            Inet6Addr(m_dialog->netmask->text().toLatin1().constData()) );
+            Inet6Addr(m_dialog->netmask->text().toShort()) );
     } catch (FWException &ex)
     {
 /* exception thrown if user types illegal m_dialog->address or