diff --git a/EduNetworkBuilder/VLANConfig.cs b/EduNetworkBuilder/VLANConfig.cs
index 75684c7..d64ab21 100644
--- a/EduNetworkBuilder/VLANConfig.cs
+++ b/EduNetworkBuilder/VLANConfig.cs
@@ -59,6 +59,8 @@ namespace EduNetworkBuilder
                 {
                     dgv_VLANNames.Columns[2].ReadOnly = LockedNames;
                 }
+                if (LockedNames)
+                    dgv_VLANNames.AllowUserToAddRows = false;
             }
         }