diff --git a/src/mds/Locker.cc b/src/mds/Locker.cc
index d848ec9fe934f..0247be6db5df9 100644
--- a/src/mds/Locker.cc
+++ b/src/mds/Locker.cc
@@ -5778,6 +5778,7 @@ void Locker::handle_file_lock(ScatterLock *lock, const cref_t<MLock> &m)
   case LOCK_AC_SYNC:
     ceph_assert(lock->get_state() == LOCK_LOCK ||
 	   lock->get_state() == LOCK_MIX ||
+	   lock->get_state() == LOCK_MIX_SYNC ||
 	   lock->get_state() == LOCK_MIX_SYNC2);
     
     if (lock->get_state() == LOCK_MIX) {