diff --git a/src/core/thread/mle.cpp b/src/core/thread/mle.cpp
index b6a537843..33bd615e5 100644
--- a/src/core/thread/mle.cpp
+++ b/src/core/thread/mle.cpp
@@ -4586,9 +4586,6 @@ Error Mle::TxMessage::AppendAddressRegistrationTlv(AddressRegistrationMode aMode
     uint8_t                  length      = 0;
     uint8_t                  counter     = 0;
     uint16_t                 startOffset = GetLength();
-#if OPENTHREAD_CONFIG_DUA_ENABLE
-    Ip6::Address domainUnicastAddress;
-#endif
 
     tlv.SetType(Tlv::kAddressRegistration);
     SuccessOrExit(error = Append(tlv));
@@ -4604,21 +4601,18 @@ Error Mle::TxMessage::AppendAddressRegistrationTlv(AddressRegistrationMode aMode
     counter++;
 
 #if OPENTHREAD_CONFIG_DUA_ENABLE
-    // Cache Domain Unicast Address.
-    domainUnicastAddress = Get<DuaManager>().GetDomainUnicastAddress();
-
-    if (Get<ThreadNetif>().HasUnicastAddress(domainUnicastAddress))
+    if (Get<ThreadNetif>().HasUnicastAddress(Get<DuaManager>().GetDomainUnicastAddress()))
     {
-        SuccessOrAssert(Get<NetworkData::Leader>().GetContext(domainUnicastAddress, context));
+        SuccessOrAssert(Get<NetworkData::Leader>().GetContext(Get<DuaManager>().GetDomainUnicastAddress(), context));
 
         // Prioritize DUA, compressed entry
         entry.SetContextId(context.mContextId);
-        entry.SetIid(domainUnicastAddress.GetIid());
+        entry.SetIid(Get<DuaManager>().GetDomainUnicastAddress().GetIid());
         SuccessOrExit(error = AppendBytes(&entry, entry.GetLength()));
         length += entry.GetLength();
         counter++;
     }
-#endif // OPENTHREAD_CONFIG_DUA_ENABLE
+#endif
 
     for (const Ip6::Netif::UnicastAddress &addr : Get<ThreadNetif>().GetUnicastAddresses())
     {
@@ -4629,8 +4623,7 @@ Error Mle::TxMessage::AppendAddressRegistrationTlv(AddressRegistrationMode aMode
         }
 
 #if OPENTHREAD_CONFIG_DUA_ENABLE
-        // Skip DUA that was already appended above.
-        if (addr.GetAddress() == domainUnicastAddress)
+        if (addr.GetAddress() == Get<DuaManager>().GetDomainUnicastAddress())
         {
             continue;
         }