diff --git a/mrbgems/mruby-io/test/io.rb b/mrbgems/mruby-io/test/io.rb
index 47c70cc60..76ae13a58 100644
--- a/mrbgems/mruby-io/test/io.rb
+++ b/mrbgems/mruby-io/test/io.rb
@@ -27,7 +27,6 @@ def assert_io_open(meth)
 
     assert_raise(RuntimeError) { IO.__send__(meth, 1023) } # For Windows
     assert_raise(RuntimeError) { IO.__send__(meth, 1 << 26) }
-    assert_raise(RuntimeError) { IO.__send__(meth, 1 << 32) } if (1 << 32).kind_of?(Integer)
   end
 end