diff --git a/mrblib/kernel.rb b/mrblib/kernel.rb
index f72ab6106..510c89e17 100644
--- a/mrblib/kernel.rb
+++ b/mrblib/kernel.rb
@@ -18,13 +18,13 @@ module Kernel
 
   ##
   # ISO 15.3.1.2.8 Kernel.loop
-  # provided by Kernel#loop
+  # not provided by mruby
 
   ##
   # Calls the given block repetitively.
   #
   # ISO 15.3.1.3.29
-  def loop(&block)
+  private def loop(&block)
     return to_enum :loop unless block
 
     while true
diff --git a/test/t/kernel.rb b/test/t/kernel.rb
index 934d9aaba..315035939 100644
--- a/test/t/kernel.rb
+++ b/test/t/kernel.rb
@@ -13,16 +13,7 @@ end
 
 # Kernel.lambda is not provided by mruby. '15.3.1.2.6'
 
-assert('Kernel.loop', '15.3.1.2.8') do
-  i = 0
-
-  Kernel.loop do
-    i += 1
-    break if i == 100
-  end
-
-  assert_equal 100, i
-end
+# Kernel.loop is not provided by mruby. '15.3.1.2.8'
 
 # Kernel.p is provided by the mruby-io mrbgem. '15.3.1.2.9'