1 files changed, 1 insertions, 1 deletions
diff --git a/unixish.h b/unixish.h
index f4fe1779c0..492b24a401 100644
--- a/unixish.h
+++ b/unixish.h
@@ -122,7 +122,7 @@
 #  ifdef POSIX_BC
 #    define PERL_SYS_INIT(c,v)	sigignore(SIGFPE); MALLOC_INIT
 #  else
-#    ifdef CYGWIN
+#    ifdef __CYGWIN__
 #      define PERL_SYS_INIT(c,v) Perl_my_setenv_init(&environ); MALLOC_INIT
 #    else
 #      define PERL_SYS_INIT(c,v) MALLOC_INIT