diff --git a/core/basic_object.rbs b/core/basic_object.rbs
index 3126e2b88..5302fb44f 100644
--- a/core/basic_object.rbs
+++ b/core/basic_object.rbs
@@ -369,4 +369,6 @@ class BasicObject
   #     Undefining one
   #
   def singleton_method_undefined: (Symbol name) -> nil
+
+  def self.superclass -> nil
 end
diff --git a/core/class.rbs b/core/class.rbs
index abfdc2164..fb2d1e1fe 100644
--- a/core/class.rbs
+++ b/core/class.rbs
@@ -216,5 +216,5 @@ class Class < Module
   #
   #     BasicObject.superclass   #=> nil
   #
-  def superclass: () -> Class?
+  # def superclass: () -> Class?
 end
diff --git a/core/object.rbs b/core/object.rbs
index 2fee491f4..1f3f61b83 100644
--- a/core/object.rbs
+++ b/core/object.rbs
@@ -107,6 +107,8 @@
 #
 class Object < BasicObject
   include Kernel
+
+  def self.superclass() -> Class
 end
 
 # A previous incarnation of `interned` for backward-compatibility (see #1499)