diff --git a/hotkeywrapper.cc b/hotkeywrapper.cc
index bc8e6003..c9481982 100644
--- a/hotkeywrapper.cc
+++ b/hotkeywrapper.cc
@@ -27,7 +27,7 @@ QHotkeyApplication::QHotkeyApplication( int & argc, char ** argv ):
   connect( this, SIGNAL( saveStateRequest( QSessionManager& ) ),
            this, SLOT( hotkeyAppSaveState( QSessionManager& ) ), Qt::DirectConnection );
 
-#if defined( Q_OS_WIN ) && IS_QT_5
+#if defined( Q_OS_WIN ) 
   installNativeEventFilter( this );
 #endif
 }
@@ -45,7 +45,7 @@ QHotkeyApplication::QHotkeyApplication( QString const & id,
   connect( this, SIGNAL( saveStateRequest( QSessionManager& ) ),
            this, SLOT( hotkeyAppSaveState( QSessionManager& ) ), Qt::DirectConnection );
 
-#if defined( Q_OS_WIN ) && IS_QT_5
+#if defined( Q_OS_WIN ) 
   installNativeEventFilter( this );
 #endif
 }
@@ -478,9 +478,6 @@ void HotkeyWrapper::unregister()
   (static_cast<QHotkeyApplication*>(qApp))->unregisterWrapper(this);
 }
 
-
-#if IS_QT_5
-
 bool QHotkeyApplication::nativeEventFilter( const QByteArray & /*eventType*/, void * message, long * result )
 {
   MSG * msg = reinterpret_cast< MSG * >( message );
@@ -503,30 +500,6 @@ bool QHotkeyApplication::nativeEventFilter( const QByteArray & /*eventType*/, vo
   return false;
 }
 
-#else // IS_QT_5
-
-bool QHotkeyApplication::winEventFilter ( MSG * message, long * result )
-{
-  if (message->message == WM_HOTKEY || message->message == GD_HOTKEY_MESSAGE)
-  {
-    for (int i = 0; i < hotkeyWrappers.size(); i++)
-    {
-      if ( hotkeyWrappers.at(i)->winEvent( message, result ) )
-        return true;
-    }
-  }
-
-  if( mainWindow )
-  {
-    if( ( static_cast< MainWindow * >( mainWindow ) )->handleGDMessage( message, result ) )
-      return true;
-  }
-
-  return QApplication::winEventFilter( message, result );
-}
-
-#endif
-
 //////////////////////////////////////////////////////////////////////////
 
 #else
diff --git a/hotkeywrapper.hh b/hotkeywrapper.hh
index 8c3027c3..cdf85af8 100644
--- a/hotkeywrapper.hh
+++ b/hotkeywrapper.hh
@@ -215,7 +215,7 @@ public:
 // by Qt meta-object compiler
 
 class QIntermediateApplication : public QtSingleApplication
-#if defined( Q_OS_WIN ) && IS_QT_5
+#if defined( Q_OS_WIN ) 
         , public QAbstractNativeEventFilter
 #endif
 {
@@ -255,11 +255,7 @@ protected:
   void unregisterWrapper(HotkeyWrapper *wrapper);
 
 #ifdef Q_OS_WIN32
-#if IS_QT_5
   virtual bool nativeEventFilter( const QByteArray & eventType, void * message, long * result );
-#else // IS_QT_5
-  virtual bool winEventFilter ( MSG * message, long * result );
-#endif // IS_QT_5
 
   QWidget * mainWindow;
 public:
diff --git a/mediawiki.cc b/mediawiki.cc
index 29277c5e..c93dc49a 100644
--- a/mediawiki.cc
+++ b/mediawiki.cc
@@ -130,11 +130,7 @@ MediaWikiWordSearchRequest::MediaWikiWordSearchRequest( wstring const & str,
   GD_DPRINTF( "request begin\n" );
   QUrl reqUrl( url + "/api.php?action=query&list=allpages&aplimit=40&format=xml" );
 
-#if IS_QT_5
   Qt4x5::Url::addQueryItem( reqUrl, "apfrom", gd::toQString( str ).replace( '+', "%2B" ) );
-#else
-  reqUrl.addEncodedQueryItem( "apfrom", QUrl::toPercentEncoding( gd::toQString( str ) ) );
-#endif
 
   netReply = mgr.get( QNetworkRequest( reqUrl ) );
 
@@ -295,11 +291,7 @@ void MediaWikiArticleRequest::addQuery( QNetworkAccessManager & mgr,
 
   QUrl reqUrl( url + "/api.php?action=parse&prop=text|revid&format=xml&redirects" );
 
-#if IS_QT_5
   Qt4x5::Url::addQueryItem( reqUrl, "page", gd::toQString( str ).replace( '+', "%2B" ) );
-#else
-  reqUrl.addEncodedQueryItem( "page", QUrl::toPercentEncoding( gd::toQString( str ) ) );
-#endif
 
   QNetworkReply * netReply = mgr.get( QNetworkRequest( reqUrl ) );
   
diff --git a/qt4x5.hh b/qt4x5.hh
index 2995844d..5053d601 100644
--- a/qt4x5.hh
+++ b/qt4x5.hh
@@ -3,32 +3,19 @@
 #ifndef QT4X5_HH
 #define QT4X5_HH
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-# define IS_QT_5    0
-#else
-# define IS_QT_5    1
-#endif
-
 #include <QString>
 #include <QAtomicInt>
 #include <QTextDocument>
 
 #include <QUrl>
-#if IS_QT_5
 #include <QUrlQuery>
-#endif
 
 namespace Qt4x5
 {
 
 inline QString escape( QString const & plain )
 {
-#if IS_QT_5
   return plain.toHtmlEscaped();
-#else
-  return Qt::escape( plain );
-#endif
-
 }
 
 namespace AtomicInt
@@ -36,11 +23,7 @@ namespace AtomicInt
 
 inline int loadAcquire( QAtomicInt const & ref )
 {
-#if IS_QT_5
   return ref.loadAcquire();
-#else
-  return ( int )ref;
-#endif
 }
 
 }
@@ -53,114 +36,68 @@ namespace Url
 //       https://codereview.qt-project.org/#change,38257
 inline QString ensureLeadingSlash( const QString & path )
 {
-#if IS_QT_5
   QLatin1Char slash( '/' );
   if ( path.startsWith( slash ) )
     return path;
   return slash + path;
-#else
-  return path;
-#endif
 }
 
 inline bool hasQueryItem( QUrl const & url, QString const & key )
 {
-#if IS_QT_5
   return QUrlQuery( url ).hasQueryItem( key );
-#else
-  return url.hasQueryItem( key );
-#endif
 }
 
 inline QString queryItemValue( QUrl const & url, QString const & item )
 {
-#if IS_QT_5
   return QUrlQuery( url ).queryItemValue( item, QUrl::FullyDecoded );
-#else
-  return url.queryItemValue( item );
-#endif
 }
 
 inline QByteArray encodedQueryItemValue( QUrl const & url, QString const & item )
 {
-#if IS_QT_5
   return QUrlQuery( url ).queryItemValue( item, QUrl::FullyEncoded ).toLatin1();
-#else
-  return url.encodedQueryItemValue( item.toLatin1() );
-#endif
 }
 
 inline void addQueryItem( QUrl & url, QString const & key, QString const & value )
 {
-#if IS_QT_5
   QUrlQuery urlQuery( url );
   urlQuery.addQueryItem( key, value );
   url.setQuery( urlQuery );
-#else
-  url.addQueryItem( key, value );
-#endif
 }
 
 inline void removeQueryItem( QUrl & url, QString const & key )
 {
-#if IS_QT_5
   QUrlQuery urlQuery( url );
   urlQuery.removeQueryItem( key );
   url.setQuery( urlQuery );
-#else
-  url.removeQueryItem( key );
-#endif
 }
 
 inline void setQueryItems( QUrl & url, QList< QPair< QString, QString > > const & query )
 {
-#if IS_QT_5
   QUrlQuery urlQuery( url );
   urlQuery.setQueryItems( query );
   url.setQuery( urlQuery );
-#else
-  url.setQueryItems( query );
-#endif
 }
 
 inline QString path( QUrl const & url )
 {
-#if IS_QT_5
   return url.path( QUrl::FullyDecoded );
-#else
-  return url.path();
-#endif
 }
 
 inline void setFragment( QUrl & url, const QString & fragment )
 {
-#if IS_QT_5
   url.setFragment( fragment, QUrl::DecodedMode );
-#else
-  url.setFragment( fragment );
-#endif
 }
 
 inline QString fragment( const QUrl & url )
 {
-#if IS_QT_5
   return url.fragment( QUrl::FullyDecoded );
-#else
-  return url.fragment();
-#endif
 }
 
 }
 
 namespace Dom
 {
-
-#if IS_QT_5
-typedef int size_type;
-#else
-typedef uint size_type;
-#endif
-
+  typedef int size_type;
 }
 
 }