diff --git a/mrbgems/mruby-io/README.md b/mrbgems/mruby-io/README.md
index 525785fa0..6e0a8cc84 100644
--- a/mrbgems/mruby-io/README.md
+++ b/mrbgems/mruby-io/README.md
@@ -165,7 +165,7 @@ Add the line below to your build configuration.
 | File#flock                  | o        |          |
 | File#lstat                  |          |          |
 | File#mtime                  |          |          |
-| File#path, File#to_path     | o        |          |
+| File#path                   | o        |          |
 | File#size                   |          |          |
 | File#truncate               |          |          |
 
diff --git a/mrbgems/mruby-io/mrblib/file.rb b/mrbgems/mruby-io/mrblib/file.rb
index 9398acef6..b706cf0de 100644
--- a/mrbgems/mruby-io/mrblib/file.rb
+++ b/mrbgems/mruby-io/mrblib/file.rb
@@ -199,8 +199,6 @@ class File < IO
   def self.path(filename)
     if filename.kind_of?(String)
       filename
-    elsif filename.respond_to?(:to_path)
-      filename.to_path
     else
       raise TypeError, "no implicit conversion of #{filename.class} into String"
     end