diff --git a/Storage/Disk/DiskImage/DiskImageImplementation.hpp b/Storage/Disk/DiskImage/DiskImageImplementation.hpp
index 3fb13bb38..c73e70bf3 100644
--- a/Storage/Disk/DiskImage/DiskImageImplementation.hpp
+++ b/Storage/Disk/DiskImage/DiskImageImplementation.hpp
@@ -25,7 +25,7 @@ template <typename T> void DiskImageHolder<T>::flush_tracks() {
 		using TrackMap = std::map<Track::Address, std::shared_ptr<Track>>;
 		std::shared_ptr<TrackMap> track_copies(new TrackMap);
 		for(auto &address : unwritten_tracks_) {
-			track_copies->insert(std::make_pair(address, cached_tracks_[address]->clone()));
+			track_copies->insert(std::make_pair(address, std::shared_ptr<Track>(cached_tracks_[address]->clone())));
 		}
 		unwritten_tracks_.clear();