diff --git a/include/libtorrent/disk_io_thread.hpp b/include/libtorrent/disk_io_thread.hpp
index 15d3c422f..71d69fc9c 100644
--- a/include/libtorrent/disk_io_thread.hpp
+++ b/include/libtorrent/disk_io_thread.hpp
@@ -189,6 +189,10 @@ namespace libtorrent
 		{ return m_allocations; }
 #endif
 
+#ifdef TORRENT_DISK_STATS
+		std::ofstream m_disk_access_log;
+#endif
+
 		void release_memory();
 
 		int in_use() const { return m_in_use; }
@@ -269,10 +273,6 @@ namespace libtorrent
 		void check_invariant() const;
 #endif
 		
-#ifdef TORRENT_DISK_STATS
-		std::ofstream m_disk_access_log;
-#endif
-
 		struct cached_block_entry
 		{
 			cached_block_entry(): buf(0) {}
diff --git a/src/disk_io_thread.cpp b/src/disk_io_thread.cpp
index 82f43d050..6225f28b3 100644
--- a/src/disk_io_thread.cpp
+++ b/src/disk_io_thread.cpp
@@ -62,6 +62,9 @@ namespace libtorrent
 		m_log.open("disk_buffers.log", std::ios::trunc);
 		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
 		m_magic = 0x1337;
@@ -282,10 +285,6 @@ 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);
-		m_disk_access_log.open("disk_access.log", std::ios::trunc);
-#endif
 	}
 
 	disk_io_thread::~disk_io_thread()
diff --git a/src/storage.cpp b/src/storage.cpp
index 88912be7a..238844eca 100644
--- a/src/storage.cpp
+++ b/src/storage.cpp
@@ -1206,16 +1206,22 @@ ret:
 		, int num_bufs)
 	{
 #ifdef TORRENT_DISK_STATS
-		disk_io_thread* iothread = (disk_io_thread*)disk_pool();
-		iothread->m_disk_access_log << log_time() << " write "
-			<< (size_type(slot) * m_files.piece_length() + offset) << std::endl;
+		disk_buffer_pool* pool = disk_pool();
+		if (pool)
+		{
+			pool->m_disk_access_log << log_time() << " write "
+				<< (size_type(slot) * m_files.piece_length() + offset) << std::endl;
+		}
 #endif
 		fileop op = { &file::writev, &storage::write_unaligned
 			, m_settings ? settings().disk_io_write_mode : 0, file::read_write };
 #ifdef TORRENT_DISK_STATS
 		int ret = readwritev(bufs, slot, offset, num_bufs, op);
-		iothread->m_disk_access_log << log_time() << " write_end "
-			<< (size_type(slot) * m_files.piece_length() + offset + ret) << std::endl;
+		if (pool)
+		{
+			pool->m_disk_access_log << log_time() << " write_end "
+				<< (size_type(slot) * m_files.piece_length() + offset + ret) << std::endl;
+		}
 		return ret;
 #else
 		return readwritev(bufs, slot, offset, num_bufs, op);
@@ -1226,16 +1232,22 @@ ret:
 		, int num_bufs)
 	{
 #ifdef TORRENT_DISK_STATS
-		disk_io_thread* iothread = (disk_io_thread*)disk_pool();
-		iothread->m_disk_access_log << log_time() << " read "
-			<< (size_type(slot) * m_files.piece_length() + offset) << std::endl;
+		disk_buffer_pool* pool = disk_pool();
+		if (pool)
+		{
+			pool->m_disk_access_log << log_time() << " read "
+				<< (size_type(slot) * m_files.piece_length() + offset) << std::endl;
+		}
 #endif
 		fileop op = { &file::readv, &storage::read_unaligned
 			, m_settings ? settings().disk_io_read_mode : 0, file::read_only };
 #ifdef TORRENT_DISK_STATS
 		int ret = readwritev(bufs, slot, offset, num_bufs, op);
-		iothread->m_disk_access_log << log_time() << " read_end "
-			<< (size_type(slot) * m_files.piece_length() + offset + ret) << std::endl;
+		if (pool)
+		{
+			pool->m_disk_access_log << log_time() << " read_end "
+				<< (size_type(slot) * m_files.piece_length() + offset + ret) << std::endl;
+		}
 		return ret;
 #else
 		return readwritev(bufs, slot, offset, num_bufs, op);