diff --git a/resources/qml/AddMachineDialog.qml b/resources/qml/AddMachineDialog.qml
index 109ea07695..a635f1f8d1 100644
--- a/resources/qml/AddMachineDialog.qml
+++ b/resources/qml/AddMachineDialog.qml
@@ -1,4 +1,4 @@
-// Copyright (c) 2016 Ultimaker B.V.
+// Copyright (c) 2017 Ultimaker B.V.
 // Cura is released under the terms of the LGPLv3 or higher.
 
 import QtQuick 2.2
@@ -25,6 +25,15 @@ UM.Dialog
     width: minimumWidth
     height: minimumHeight
 
+    flags: {
+        var window_flags = Qt.Dialog | Qt.CustomizeWindowHint | Qt.WindowTitleHint;
+        if (Cura.MachineManager.activeDefinitionId !== "") //Disallow closing the window if we have no active printer yet. You MUST add a printer.
+        {
+            window_flags |= Qt.WindowCloseButtonHint;
+        }
+        return window_flags;
+    }
+
     onVisibilityChanged:
     {
         // Reset selection and machine name