2 files changed, 3 insertions, 3 deletions
diff --git a/mrbgems/mruby-io/mrblib/file.rb b/mrbgems/mruby-io/mrblib/file.rb
index aa73252e1..9398acef6 100644
--- a/mrbgems/mruby-io/mrblib/file.rb
+++ b/mrbgems/mruby-io/mrblib/file.rb
@@ -2,7 +2,7 @@ class File < IO
   attr_accessor :path
 
   def initialize(fd_or_path, mode = "r", perm = 0666)
-    if fd_or_path.kind_of? Fixnum
+    if fd_or_path.kind_of? Integer
       super(fd_or_path, mode)
     else
       @path = fd_or_path
diff --git a/mrbgems/mruby-io/mrblib/io.rb b/mrbgems/mruby-io/mrblib/io.rb
index e597db886..034f88529 100644
--- a/mrbgems/mruby-io/mrblib/io.rb
+++ b/mrbgems/mruby-io/mrblib/io.rb
@@ -186,7 +186,7 @@ class IO
 
   def read(length = nil, outbuf = "")
     unless length.nil?
-      unless length.is_a? Fixnum
+      unless length.is_a? Integer
         raise TypeError.new "can't convert #{length.class} into Integer"
       end
       if length < 0
@@ -229,7 +229,7 @@ class IO
     case arg
     when String
       rs = arg
-    when Fixnum
+    when Integer
       rs = "\n"
       limit = arg
     else