diff --git a/ChangeLog b/ChangeLog
index 3332182ea..0f73884e6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -79,6 +79,7 @@
 	  incoming connection
 	* added more detailed instrumentation of the disk I/O thread
 
+	* fixed mingw build
 	* fixed minor bug in metadata block requester (for magnet links)
 	* fixed race condition in iconv string converter
 	* fixed error handling in torrent_info constructor
diff --git a/src/file.cpp b/src/file.cpp
index 0038db640..17fb1ff7d 100644
--- a/src/file.cpp
+++ b/src/file.cpp
@@ -46,6 +46,10 @@ POSSIBILITY OF SUCH DAMAGE.
 #ifdef TORRENT_WINDOWS
 // windows part
 
+#ifndef PtrToPtr64
+#define PtrToPtr64(x) (x)
+#endif
+
 #include "libtorrent/utf8.hpp"
 
 #ifndef WIN32_LEAN_AND_MEAN