diff --git a/lib/rack/webconsole/asset_helpers.rb b/lib/rack/webconsole/asset_helpers.rb
index e7fe5fc..9d61021 100644
--- a/lib/rack/webconsole/asset_helpers.rb
+++ b/lib/rack/webconsole/asset_helpers.rb
@@ -48,7 +48,10 @@ def js_code
 
       def asset(file)
         @assets ||= {}
-        @assets[file] ||= ::File.read(::File.join(::File.dirname(__FILE__), '..', '..', '..', 'public', file))
+        output = ::File.open(::File.join(::File.dirname(__FILE__), '..', '..', '..', 'public', file), 'r:UTF-8') do |f|
+          f.read
+        end
+        @assets[file] ||= output
       end
     end
   end
diff --git a/lib/rack/webconsole/repl.rb b/lib/rack/webconsole/repl.rb
index 904dfbe..e7da8c7 100644
--- a/lib/rack/webconsole/repl.rb
+++ b/lib/rack/webconsole/repl.rb
@@ -1,6 +1,7 @@
 # encoding: utf-8
 require 'json'
 require 'digest/sha1'
+
 module Rack
   class Webconsole
     # {Repl} is a Rack middleware acting as a Ruby evaluator application.
diff --git a/spec/rack/webconsole/asset_helpers_spec.rb b/spec/rack/webconsole/asset_helpers_spec.rb
index 53b75c2..b981bf2 100644
--- a/spec/rack/webconsole/asset_helpers_spec.rb
+++ b/spec/rack/webconsole/asset_helpers_spec.rb
@@ -1,3 +1,4 @@
+# encoding: utf-8
 require 'spec_helper'
 
 class AssetClass
diff --git a/spec/rack/webconsole/assets_spec.rb b/spec/rack/webconsole/assets_spec.rb
index 18b4db6..0ed6f76 100644
--- a/spec/rack/webconsole/assets_spec.rb
+++ b/spec/rack/webconsole/assets_spec.rb
@@ -1,3 +1,4 @@
+# encoding: utf-8
 require 'spec_helper'
 require 'ostruct'