diff --git a/include/wx/filefn.h b/include/wx/filefn.h
index 694acb6d07..e826869296 100644
--- a/include/wx/filefn.h
+++ b/include/wx/filefn.h
@@ -242,12 +242,15 @@ enum wxFileKind
     #endif // wxHAS_HUGE_FILES/!wxHAS_HUGE_FILES
 
     #ifndef __WATCOMC__
-        #if !defined(__BORLANDC__) || (__BORLANDC__ > 0x540)
-           // NB: this one is not POSIX and always has the underscore
-           #define   wxFsync      _commit
+         #if !defined(__BORLANDC__) || (__BORLANDC__ > 0x540)
+             // NB: this one is not POSIX and always has the underscore
+             #define   wxFsync      _commit
 
-           #define HAVE_FSYNC
-       #endif // BORLANDC
+             // could be already defined by configure (Cygwin)
+             #ifndef HAVE_FSYNC
+                 #define HAVE_FSYNC
+             #endif
+        #endif // BORLANDC
     #endif
 
     #define   wxEof        wxPOSIX_IDENT(eof)