diff --git a/ChangeLog b/ChangeLog
index fcbf2207b..5aac7c1d8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2014-01-18  Andrey Borzenkov <arvidjaar@gmail.com>
+
+	* include/grub/osdep/hostfile_windows.h: Use _W64 instead of
+	FILE_OFFSET_BITS to differentiate between native MinGW and Mingw W64.
+
 2014-01-18  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* grub-core/term/terminfo.c: Recognize keys F1-F12.
diff --git a/include/grub/osdep/hostfile_windows.h b/include/grub/osdep/hostfile_windows.h
index 79efcfa50..bf6451b6d 100644
--- a/include/grub/osdep/hostfile_windows.h
+++ b/include/grub/osdep/hostfile_windows.h
@@ -69,8 +69,8 @@ enum grub_util_fd_open_flags_t
 
 #if defined (__MINGW32__) && !defined (__MINGW64__)
 
-/* 32 bit on MinGW-64 already redefines them if _FILE_OFFSET_BITS=64 */
-#if !defined(_FILE_OFFSET_BITS)
+/* 32 bit on Mingw-w64 already redefines them if _FILE_OFFSET_BITS=64 */
+#ifndef _W64
 #define fseeko fseeko64
 #define ftello ftello64
 #endif