diff --git a/src/thread/vmlock.c b/src/thread/vmlock.c
index 0a69b3e3e019b4c241bc769a94acf3797bd24f35..75f3cb76190fe4e8796997e7c3d29af80fb36792 100644
--- a/src/thread/vmlock.c
+++ b/src/thread/vmlock.c
@@ -9,12 +9,12 @@ void __vm_wait()
 		__wait(vmlock, vmlock+1, tmp, 1);
 }
 
-void __vm_lock(pthread_t self)
+void __vm_lock()
 {
 	a_inc(vmlock);
 }
 
-void __vm_unlock(pthread_t self)
+void __vm_unlock()
 {
 	if (a_fetch_add(vmlock, -1)==1 && vmlock[1])
 		__wake(vmlock, -1, 1);