diff --git a/source/styles/side.cpp b/source/styles/side.cpp
deleted file mode 100644
index b380a81b..00000000
--- a/source/styles/side.cpp
+++ /dev/null
@@ -1,73 +0,0 @@
-// Copyright (c) 2014-2016 Thomas Fussell
-// Copyright (c) 2010-2015 openpyxl
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, WRISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE
-//
-// @license: http://www.opensource.org/licenses/mit-license.php
-// @author: see AUTHORS file
-#include <xlnt/styles/side.hpp>
-
-namespace xlnt {
-
-side::side()
-{
-}
-
-std::string side::to_hash_string() const
-{
-    std::string hash_string;
-    
-    hash_string.append(border_style_ ? "1" : "0");
-    
-    if(border_style_)
-    {
-        hash_string.append(std::to_string(static_cast<std::size_t>(*border_style_)));
-    }
-    
-    hash_string.append(color_ ? "1" : "0");
-    
-    if(color_)
-    {
-        hash_string.append(std::to_string(color_->hash()));
-    }
-    
-    return hash_string;
-}
-
-std::experimental::optional<border_style> &side::get_border_style()
-{
-    return border_style_;
-}
-
-const std::experimental::optional<border_style> &side::get_border_style() const
-{
-    return border_style_;
-}
-
-std::experimental::optional<color> &side::get_color()
-{
-    return color_;
-}
-
-const std::experimental::optional<color> &side::get_color() const
-{
-    return color_;
-}
-    
-} // namespace xlnt