1 files changed, 2 insertions, 0 deletions
diff --git a/perlapi.h b/perlapi.h
index 0aa98624e3..230d09f874 100644
--- a/perlapi.h
+++ b/perlapi.h
@@ -902,6 +902,8 @@ END_EXTERN_C
 #define PL_perlio_fd_refcnt	(*Perl_Gperlio_fd_refcnt_ptr(NULL))
 #undef  PL_perlio_fd_refcnt_size
 #define PL_perlio_fd_refcnt_size	(*Perl_Gperlio_fd_refcnt_size_ptr(NULL))
+#undef  PL_perlio_mutex
+#define PL_perlio_mutex		(*Perl_Gperlio_mutex_ptr(NULL))
 #undef  PL_ppaddr
 #define PL_ppaddr		(*Perl_Gppaddr_ptr(NULL))
 #undef  PL_sh_path