diff --git a/src/shareddata.h b/src/shareddata.h
index 77da957..2b440d5 100644
--- a/src/shareddata.h
+++ b/src/shareddata.h
@@ -1,88 +1,89 @@
 /*
  * shareddata.h
  *
  * Copyright (C) 2011 Christoph Pfister <christophpfister@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License along
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #ifndef SHAREDDATA_H
 #define SHAREDDATA_H
 
 #include <QSharedData>
 
 class SharedData : public QSharedData
 {
 public:
 	SharedData() { }
+	SharedData(const SharedData &sh) : QSharedData(sh) { }
 	~SharedData() { }
 
 	SharedData &operator=(const SharedData &)
 	{
 		return *this;
 	}
 };
 
 template<class T> class ExplicitlySharedDataPointer
 {
 public:
 	explicit ExplicitlySharedDataPointer(T *data_ = NULL) : data(data_) { }
 	~ExplicitlySharedDataPointer() { }
 
 	bool isValid() const
 	{
 		return (data.constData() != NULL);
 	}
 
 	const T *constData() const
 	{
 		return data.constData();
 	}
 
 	const T &operator*() const
 	{
 		return *data;
 	}
 
 	const T *operator->() const
 	{
 		return data.constData();
 	}
 
 	bool operator==(const ExplicitlySharedDataPointer<T> &other) const
 	{
 		return (data.constData() == other.data.constData());
 	}
 
 	bool operator!=(const ExplicitlySharedDataPointer<T> &other) const
 	{
 		return (data.constData() != other.data.constData());
 	}
 
 	bool operator<(const ExplicitlySharedDataPointer<T> &other) const
 	{
 		return (data.constData() < other.data.constData());
 	}
 
 	friend uint qHash(const ExplicitlySharedDataPointer<T> &pointer)
 	{
 		return qHash(pointer.data.constData());
 	}
 
 private:
 	QExplicitlySharedDataPointer<T> data;
 };
 
 #endif /* SHAREDDATA_H */