1 files changed, 1 insertions, 1 deletions
diff --git a/perlio.h b/perlio.h
index 49423aa983..ce28c8da5a 100644
--- a/perlio.h
+++ b/perlio.h
@@ -82,7 +82,7 @@ typedef PerlIOl *PerlIO;
 
 extern void	PerlIO_define_layer	(pTHX_ PerlIO_funcs *tab);
 extern SV *	PerlIO_find_layer	(pTHX_ const char *name, STRLEN len);
-extern PerlIO *	PerlIO_push		(pTHX_ PerlIO *f,PerlIO_funcs *tab,const char *mode,const char *arg,STRLEN len);
+extern PerlIO *	PerlIO_push		(pTHX_ PerlIO *f,PerlIO_funcs *tab,const char *mode,SV *arg);
 extern void	PerlIO_pop		(pTHX_ PerlIO *f);
 
 #endif /* PerlIO */