1 files changed, 2 insertions, 0 deletions
diff --git a/proto.h b/proto.h
index 28c9581241..afe67b1c29 100644
--- a/proto.h
+++ b/proto.h
@@ -1259,6 +1259,8 @@ STATIC void	S_xstat(pTHX_ int);
 #  endif
 #endif
 
+PERL_CALLCONV SV*	Perl_lock(pTHX_ SV *sv) __attribute__((noreturn));
+
 #if defined(PERL_OBJECT)
 };
 #endif