diff --git a/src/torrent.cpp b/src/torrent.cpp
index 8b28b9d6a..dd73b8784 100644
--- a/src/torrent.cpp
+++ b/src/torrent.cpp
@@ -906,6 +906,8 @@ namespace libtorrent
 	{
 		session_impl::mutex_t::scoped_lock l(m_ses.m_mutex);
 
+		INVARIANT_CHECK;
+
 		if (ret == piece_manager::disk_check_aborted)
 		{
 			return;