diff --git a/src/mirall/utility.cpp b/src/mirall/utility.cpp
index a2e22b69c5..6609b3a2b6 100644
--- a/src/mirall/utility.cpp
+++ b/src/mirall/utility.cpp
@@ -23,11 +23,14 @@
 #include <QWidget>
 #include <QDebug>
 
-#ifdef Q_OS_MAC
+#ifdef Q_OS_UNIX
+#include <sys/statvfs.h>
+#include <sys/types.h>
+#elif defined(Q_OS_MAC)
 #include <CoreServices/CoreServices.h>
-#endif
-#ifdef Q_OS_WIN
+#elif defined(Q_OS_WIN)
 #include <shlobj.h>
+#include <winbase.h>
 #endif
 
 namespace Mirall {
@@ -240,4 +243,25 @@ void Utility::setLaunchOnStartup(const QString &appName, const QString& guiName,
 #endif
 }
 
+qint64 Utility::freeDiskSpace(const QString &path, bool *ok)
+{
+#ifdef Q_OS_UNIX
+    Q_UNUSED(ok)
+    struct statvfs64 stat;
+    statvfs64(path.toUtf8().data(), &stat);
+    return (qint64) stat.f_bavail * stat.f_frsize;
+#elif defined(Q_OS_WIN)
+    ULARGE_INTEGER freeBytes;
+    freeBytes.QuadPart = 0L;
+    QString drive = QDir().absoluteFilePath(path).left(2);
+    if( !GetDiskFreeSpaceEx( reinterpret_cast<const wchar_t *>(drive.utf16()), &freeBytes, NULL, NULL ) ) {
+        if (ok) *ok = false;
+    }
+    return freeBytes.QuadPart;
+#else
+    if (ok) *ok = false;
+    return 0;
+#endif
+}
+
 } // namespace Mirall
diff --git a/src/mirall/utility.h b/src/mirall/utility.h
index e15f12cd7b..ef0d7e7823 100644
--- a/src/mirall/utility.h
+++ b/src/mirall/utility.h
@@ -31,6 +31,7 @@ namespace Utility
     void raiseDialog(QWidget *);
     bool hasLaunchOnStartup(const QString &appName);
     void setLaunchOnStartup(const QString &appName, const QString& guiName, bool launch);
+    qint64 freeDiskSpace(const QString &path, bool *ok = 0);
 }
 
 }