diff --git a/src/disk_io_thread.cpp b/src/disk_io_thread.cpp
index 4a14c59bc..446f06069 100644
--- a/src/disk_io_thread.cpp
+++ b/src/disk_io_thread.cpp
@@ -63,7 +63,6 @@ namespace libtorrent
 		m_categories["read cache"] = 0;
 		m_categories["write cache"] = 0;
 
-		m_log.open("disk_io_thread.log", std::ios::trunc);
 		m_disk_access_log.open("disk_access.log", std::ios::trunc);
 #endif
 #ifdef TORRENT_DEBUG
@@ -284,6 +283,9 @@ namespace libtorrent
 		, m_work(io_service::work(m_ios))
 		, m_disk_io_thread(boost::ref(*this))
 	{
+#ifdef TORRENT_DISK_STATS
+		m_log.open("disk_io_thread.log", std::ios::trunc);
+#endif
 	}
 
 	disk_io_thread::~disk_io_thread()