diff --git a/src/threads/thread.c b/src/threads/thread.c
index 1cf40af..79dd339 100644
--- a/src/threads/thread.c
+++ b/src/threads/thread.c
@@ -395,9 +395,8 @@ thread_set_priority (int new_base_priority)
 
   struct thread *t = thread_current ();
 
-  int old_base_priority = t->base_priority;
-  int old_priority = thread_get_priority ();
-  if (new_base_priority == old_base_priority)
+  /* If the base priority is unchanged, do nothing. */
+  if (new_base_priority == t->base_priority)
     return;
 
   t->base_priority = new_base_priority;