diff --git a/Lib/asyncio/locks.py b/Lib/asyncio/locks.py
index 842d621..741aaf2 100644
--- a/Lib/asyncio/locks.py
+++ b/Lib/asyncio/locks.py
@@ -329,7 +329,13 @@
                 self._waiters.remove(fut)
 
         finally:
-            yield from self.acquire()
+            # Must reacquire lock even if wait is cancelled
+            while True:
+                try:
+                    yield from self.acquire()
+                    break
+                except futures.CancelledError:
+                    pass
 
     @coroutine
     def wait_for(self, predicate):