diff --git a/lib/process_shared/posix/libc.rb b/lib/process_shared/posix/libc.rb
index d82e63b..9f39d8e 100644
--- a/lib/process_shared/posix/libc.rb
+++ b/lib/process_shared/posix/libc.rb
@@ -28,7 +28,7 @@ module ProcessShared
         helper = 'process_shared/posix/helper.' + suffix
         fallback_path = File.expand_path(File.dirname(__FILE__))
         path = $LOAD_PATH.find(fallback_path) do |path|
-          File.exists?(File.join(path, helper))
+          File.exist?(File.join(path, helper))
         end
 
         if  defined?(Truffle)