diff --git a/lib/ffi/io/console/stty_console.rb b/lib/ffi/io/console/stty_console.rb
index c8e549b..1bcc170 100644
--- a/lib/ffi/io/console/stty_console.rb
+++ b/lib/ffi/io/console/stty_console.rb
@@ -8,7 +8,7 @@
 
 # Non-Windows assumes stty command is available
 class IO
-  if RbConfig::CONFIG['host_os'].downcase =~ /linux/ && File.exists?("/proc/#{Process.pid}/fd")
+  if RbConfig::CONFIG['host_os'].downcase =~ /linux/ && File.exist?("/proc/#{Process.pid}/fd")
     protected def _io_console_stty(*args)
       _io_console_stty_error { `stty #{args.join(' ')} < /proc/#{Process.pid}/fd/#{fileno}` }
     end