diff --git a/src/threads/synch.c b/src/threads/synch.c
index 027018e..cdfb2dc 100644
--- a/src/threads/synch.c
+++ b/src/threads/synch.c
@@ -189,6 +189,8 @@ lock_init (struct lock *lock)
 
 static void
 donate_priority (struct thread *donor, struct thread *donee) {
+  list_push_back (&donee->donors_list, &donor->donor_elem);
+  
   while (donee != NULL)
     {
       if (donor->priority <= donee->priority)