diff --git a/src/streams/qtiocompressor.h b/src/streams/qtiocompressor.h
index d8fd383d5..f325bb663 100644
--- a/src/streams/qtiocompressor.h
+++ b/src/streams/qtiocompressor.h
@@ -49,24 +49,8 @@
 
 #include <QtCore/QIODevice>
 
-#if defined(Q_OS_WIN)
-#  if !defined(QT_QTIOCOMPRESSOR_EXPORT) && !defined(QT_QTIOCOMPRESSOR_IMPORT)
-#    define QT_QTIOCOMPRESSOR_EXPORT
-#  elif defined(QT_QTIOCOMPRESSOR_IMPORT)
-#    if defined(QT_QTIOCOMPRESSOR_EXPORT)
-#      undef QT_QTIOCOMPRESSOR_EXPORT
-#    endif
-#    define QT_QTIOCOMPRESSOR_EXPORT __declspec(dllimport)
-#  elif defined(QT_QTIOCOMPRESSOR_EXPORT)
-#    undef QT_QTIOCOMPRESSOR_EXPORT
-#    define QT_QTIOCOMPRESSOR_EXPORT __declspec(dllexport)
-#  endif
-#else
-#  define QT_QTIOCOMPRESSOR_EXPORT
-#endif
-
 class QtIOCompressorPrivate;
-class QT_QTIOCOMPRESSOR_EXPORT QtIOCompressor : public QIODevice
+class QtIOCompressor : public QIODevice
 {
 Q_OBJECT
 public: