diff --git a/fs_mgr/libdm/dm_target.cpp b/fs_mgr/libdm/dm_target.cpp
index da1013e..f7497f6 100644
--- a/fs_mgr/libdm/dm_target.cpp
+++ b/fs_mgr/libdm/dm_target.cpp
@@ -218,7 +218,8 @@
 }
 
 std::string DmTargetDefaultKey::GetParameterString() const {
-    return cipher_ + " " + key_ + " " + blockdev_ + " " + std::to_string(start_sector_);
+    return cipher_ + " " + key_ + " " + blockdev_ + " " + std::to_string(start_sector_) +
+           (set_dun_ ? " 1 set_dun" : "");
 }
 
 }  // namespace dm
diff --git a/fs_mgr/libdm/include/libdm/dm_target.h b/fs_mgr/libdm/include/libdm/dm_target.h
index 722922d..e8885c7 100644
--- a/fs_mgr/libdm/include/libdm/dm_target.h
+++ b/fs_mgr/libdm/include/libdm/dm_target.h
@@ -277,12 +277,14 @@
 class DmTargetDefaultKey final : public DmTarget {
   public:
     DmTargetDefaultKey(uint64_t start, uint64_t length, const std::string& cipher,
-                       const std::string& key, const std::string& blockdev, uint64_t start_sector)
+                       const std::string& key, const std::string& blockdev, uint64_t start_sector,
+                       bool set_dun = false)
         : DmTarget(start, length),
           cipher_(cipher),
           key_(key),
           blockdev_(blockdev),
-          start_sector_(start_sector) {}
+          start_sector_(start_sector),
+          set_dun_(set_dun) {}
 
     std::string name() const override { return "default-key"; }
     bool Valid() const override { return true; }
@@ -293,6 +295,7 @@
     std::string key_;
     std::string blockdev_;
     uint64_t start_sector_;
+    bool set_dun_;
 };
 
 }  // namespace dm