diff --git a/test/t/syntax.rb b/test/t/syntax.rb
index 461f5430b..299394557 100644
--- a/test/t/syntax.rb
+++ b/test/t/syntax.rb
@@ -381,7 +381,7 @@ assert('splat in case statement') do
 end
 
 assert('External command execution.') do
-  class << Kernel
+  module Kernel
     sym = '`'.to_sym
     alias_method :old_cmd, sym