diff --git a/src/kiri/main.js b/src/kiri/main.js
index 253b3449..64773e75 100644
--- a/src/kiri/main.js
+++ b/src/kiri/main.js
@@ -2110,7 +2110,7 @@
                 device.internal++;
                 updateExtruderFields(device);
             };
-            UI.extDel.disabled = device.extruders.length < 2;
+            UI.extDel.disabled = UI.extDel.disabled || device.extruders.length < 2;
             UI.extDel.onclick = function() {
                 device.extruders.splice(device.internal,1);
                 device.internal = Math.min(device.internal, device.extruders.length-1);