1 files changed, 1 insertions, 1 deletions
diff --git a/perlio.h b/perlio.h
index 4efdae3683..51b9a83719 100644
--- a/perlio.h
+++ b/perlio.h
@@ -189,7 +189,7 @@ extern int	PerlIO_puts		(PerlIO *,const char *);
 #ifndef PerlIO_open
 extern PerlIO *	PerlIO_open		(const char *,const char *);
 #endif
-#ifndef PerlIO_open
+#ifndef PerlIO_openn
 extern PerlIO *	PerlIO_openn		(pTHX_ const char *layers, const char *mode,int fd,int imode,int perm,PerlIO *old,int narg,SV **arg);
 #endif
 #ifndef PerlIO_close