diff --git a/src/libthread/threadimpl.h b/src/libthread/threadimpl.h
index 6368ff5..bbf8473 100644
--- a/src/libthread/threadimpl.h
+++ b/src/libthread/threadimpl.h
@@ -76,6 +76,7 @@
 
 extern	void	_procsleep(_Procrendez*);
 extern	void	_procwakeup(_Procrendez*);
+extern	void	_procwakeupandunlock(_Procrendez*);
 
 struct Proc
 {