diff --git a/aos/common/mutex.cc b/aos/common/mutex.cc
index c5b8652..eed5b0b 100644
--- a/aos/common/mutex.cc
+++ b/aos/common/mutex.cc
@@ -28,6 +28,8 @@
   const int ret = mutex_grab(&impl_);
   if (ret == 0) {
     return false;
+  } else if (ret == 1) {
+    return true;
   } else {
     LOG(FATAL, "mutex_grab(%p(=%" PRIu32 ")) failed with %d\n",
         &impl_, impl_.futex, ret);
@@ -43,6 +45,8 @@
   switch (ret) {
     case 0:
       return State::kLocked;
+    case 1:
+      return State::kOwnerDied;
     case 4:
       return State::kLockFailed;
     default: