diff --git a/aos/linux_code/ipc_lib/mutex.cc b/aos/linux_code/ipc_lib/mutex.cc
index 796b841..c5b8652 100644
--- a/aos/linux_code/ipc_lib/mutex.cc
+++ b/aos/linux_code/ipc_lib/mutex.cc
@@ -44,7 +44,7 @@
     case 0:
       return State::kLocked;
     case 4:
-      return State::kUnlocked;
+      return State::kLockFailed;
     default:
       LOG(FATAL, "mutex_trylock(%p(=%" PRIu32 ")) failed with %d\n",
           &impl_, impl_.futex, ret);