1 files changed, 1 insertions, 1 deletions
diff --git a/perl.h b/perl.h
index 36a7cce62e..37ef3f1983 100644
--- a/perl.h
+++ b/perl.h
@@ -1712,7 +1712,7 @@ typedef pthread_key_t	perl_key;
 #   endif
 #endif
 
-#if defined(CYGWIN)
+#if defined(__CYGWIN__)
 /* USEMYBINMODE
  *   This symbol, if defined, indicates that the program should
  *   use the routine my_binmode(FILE *fp, char iotype) to insure