diff --git a/include/linux/signal.h b/include/linux/signal.h
index 80c7418..a39fedd 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -19,6 +19,8 @@ static inline void copy_siginfo(struct siginfo *to, struct siginfo *from)
 		memcpy(to, from, __ARCH_SI_PREAMBLE_SIZE + sizeof(from->_sifields._sigchld));
 }
 
+int copy_siginfo_to_user(struct siginfo __user *to, const struct siginfo *from);
+
 /*
  * Define some primitives to manipulate sigset_t.
  */