diff --git a/include/linux/signal.h b/include/linux/signal.h
index a2dcb94..1135e36 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -434,4 +434,9 @@
 int restore_altstack(const stack_t __user *);
 int __save_altstack(stack_t __user *, unsigned long);
 
+#ifdef CONFIG_PROC_FS
+struct seq_file;
+extern void render_sigset_t(struct seq_file *, const char *, sigset_t *);
+#endif
+
 #endif /* _LINUX_SIGNAL_H */