diff --git a/jruby/lib/io/console/common.rb b/jruby/lib/io/console/common.rb
index efa3015..876e77b 100644
--- a/jruby/lib/io/console/common.rb
+++ b/jruby/lib/io/console/common.rb
@@ -181,6 +181,7 @@ def tty?(*modes)
       end
       super()
     end
+    alias isatty tty?
   end
   private_constant :PlatformTty
 end
diff --git a/test/io/console/test_io_console.rb b/test/io/console/test_io_console.rb
index 838abb4..b59777c 100644
--- a/test/io/console/test_io_console.rb
+++ b/test/io/console/test_io_console.rb
@@ -94,6 +94,10 @@ def test_tty?
     assert_equal(STDIN.tty?, STDIN.tty?(nil))
   end
 
+  def test_isatty
+    assert_equal(IO.instance_method(:tty?), IO.instance_method(:isatty))
+  end
+
   def test_tty_non_tty
     File.open(IO::NULL) do |f|
       assert_not_predicate(f, :tty?)