diff --git a/src/common/optionsPrototype.json5 b/src/common/optionsPrototype.json5
index 191d0e1..64d1745 100644
--- a/src/common/optionsPrototype.json5
+++ b/src/common/optionsPrototype.json5
@@ -80,10 +80,6 @@
     defaultValue: false,
     context: 'options',
   },
-  'forcemarkasread': {
-    defaultValue: false,
-    context: 'options',
-  },
 
   // Experiments:
   'threadlistavatars': {
@@ -118,4 +114,8 @@
     defaultValue: false,
     context: 'deprecated',
   },
+  'forcemarkasread': {
+    defaultValue: false,
+    context: 'deprecated',
+  },
 }