diff --git a/spec/ruby/library/net-ftp/shared/puttextfile.rb b/spec/ruby/library/net-ftp/shared/puttextfile.rb
index 3836e954b8072f..4722439674afac 100644
--- a/spec/ruby/library/net-ftp/shared/puttextfile.rb
+++ b/spec/ruby/library/net-ftp/shared/puttextfile.rb
@@ -27,8 +27,8 @@
   it "sends the contents of the passed local_file, using \\r\\n as the newline separator" do
     @ftp.send(@method, @local_fixture_file, "text")
 
-    remote_lines = open(@remote_tmp_file,    "rb") {|f| f.read }
-    local_lines  = open(@local_fixture_file, "rb") {|f| f.read }
+    remote_lines = File.binread(@remote_tmp_file)
+    local_lines  = File.binread(@local_fixture_file)
 
     remote_lines.should_not == local_lines
     remote_lines.should == local_lines.gsub("\n", "\r\n")
diff --git a/test/ruby/test_dir_m17n.rb b/test/ruby/test_dir_m17n.rb
index b4b1007d629498..a403bbb3f454bd 100644
--- a/test/ruby/test_dir_m17n.rb
+++ b/test/ruby/test_dir_m17n.rb
@@ -318,7 +318,7 @@ def with_enc_path
 
   def test_glob_warning_opendir
     with_enc_path do |dir|
-      open("#{dir}/x", "w") {}
+      File.binwrite("#{dir}/x", "")
       File.chmod(0300, dir)
       next if File.readable?(dir)
       assert_warning(/#{dir}/) do
@@ -329,7 +329,7 @@ def test_glob_warning_opendir
 
   def test_glob_warning_match_all
     with_enc_path do |dir|
-      open("#{dir}/x", "w") {}
+      File.binwrite("#{dir}/x", "")
       File.chmod(0000, dir)
       next if File.readable?(dir)
       assert_warning(/#{dir}/) do