diff --git a/libs/fst/00_PATCH_win_io.patch b/libs/fst/00_PATCH_win_io.patch
index bf8679406..a5bc989a8 100644
--- a/libs/fst/00_PATCH_win_io.patch
+++ b/libs/fst/00_PATCH_win_io.patch
@@ -43,7 +43,7 @@
   * mmap compatibility
   */
 -#if defined __MINGW32__
-+#if defined __CYGWIN__ || defined __MINGW32__ || defined _MSC_VER
++#if defined __MINGW32__ || defined _MSC_VER
  #include <limits.h>
  #define fstMmap(__addr,__len,__prot,__flags,__fd,__off) fstMmap2((__len), (__fd), (__off))
  #define fstMunmap(__addr,__len)                         UnmapViewOfFile((LPCVOID)__addr)
diff --git a/libs/fst/fstapi.cc b/libs/fst/fstapi.cc
index 74e755d31..a4329cf32 100644
--- a/libs/fst/fstapi.cc
+++ b/libs/fst/fstapi.cc
@@ -341,7 +341,7 @@ return(NULL);
 /*
  * mmap compatibility
  */
-#if defined __CYGWIN__ || defined __MINGW32__ || defined _MSC_VER
+#if defined __MINGW32__ || defined _MSC_VER
 #include <limits.h>
 #define fstMmap(__addr,__len,__prot,__flags,__fd,__off) fstMmap2((__len), (__fd), (__off))
 #define fstMunmap(__addr,__len)                         UnmapViewOfFile((LPCVOID)__addr)