diff --git a/src/common/optionsPrototype.json5 b/src/common/optionsPrototype.json5
index 1b114a4..eb7d892 100644
--- a/src/common/optionsPrototype.json5
+++ b/src/common/optionsPrototype.json5
@@ -174,6 +174,12 @@
     killSwitchType: 'ignore',
   },
 
+  // Internal kill switches:
+  'killswitch_xhrproxy': {
+    context: 'internal',
+    killSwitchType: 'internalKillSwitch',
+  },
+
   // Deprecated options:
   'escalatethreads': {
     defaultValue: false,