diff --git a/CMakeLists.txt b/CMakeLists.txt
index b3a4bb9..9079192 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,7 +17,6 @@ set(HEADER_FILES
     conversion/stringconversion.h
     conversion/stringbuilder.h
     conversion/types.h
-    conversion/widen.h
     io/ansiescapecodes.h
     io/binaryreader.h
     io/binarywriter.h
diff --git a/conversion/widen.h b/conversion/widen.h
deleted file mode 100644
index 89c6c06..0000000
--- a/conversion/widen.h
+++ /dev/null
@@ -1,51 +0,0 @@
-#ifndef CONVERSION_UTILITIES_WIDEN_H
-#define CONVERSION_UTILITIES_WIDEN_H
-
-#include "../global.h"
-
-#include <functional>
-#include <iostream>
-#include <locale>
-#include <string>
-#include <vector>
-
-namespace ConversionUtilities {
-
-/*!
- * \brief Converts a std::string to a wide string using the specified locale.
- * \deprecated Might be removed in future release because not used anymore. Use iconv based string converion functions instead.
- */
-template <class E, class T = std::char_traits<E>, class A = std::allocator<E>>
-class CPP_UTILITIES_EXPORT Widen : public std::unary_function<const std::string &, std::basic_string<E, T, A>> {
-public:
-    /*!
-     * \brief Constructs a new instance with the specified \a locale.
-     */
-    Widen(const std::locale &locale = std::locale())
-        : m_loc(locale)
-        , m_pctype(&std::use_facet<std::ctype<E>>(locale))
-    {
-    }
-
-    Widen(const Widen &) = delete;
-    Widen &operator=(const Widen &) = delete;
-
-    /*!
-     * \brief Performs the conversation for the provided \a string.
-     */
-    std::basic_string<E, T, A> operator()(const std::string &string) const
-    {
-        typename std::basic_string<E, T, A>::size_type srcLen = string.length();
-        const char *srcBeg = string.c_str();
-        std::vector<E> tmp(srcLen);
-        m_pctype->widen(srcBeg, srcBeg + srcLen, &tmp[0]);
-        return std::basic_string<E, T, A>(&tmp[0], srcLen);
-    }
-
-private:
-    std::locale m_loc;
-    const std::ctype<E> *m_pctype;
-};
-} // namespace ConversionUtilities
-
-#endif // CONVERSION_UTILITIES_WIDEN_H