diff --git a/src/core/api/ip6_api.cpp b/src/core/api/ip6_api.cpp
index 3157b1b67..65e1fca27 100644
--- a/src/core/api/ip6_api.cpp
+++ b/src/core/api/ip6_api.cpp
@@ -252,7 +252,7 @@ otError otIp6SelectSourceAddress(otInstance *aInstance, otMessageInfo *aMessageI
 
     netifAddr = instance.Get<Ip6::Ip6>().SelectSourceAddress(*static_cast<Ip6::MessageInfo *>(aMessageInfo));
     VerifyOrExit(netifAddr != nullptr, error = OT_ERROR_NOT_FOUND);
-    memcpy(&aMessageInfo->mSockAddr, &netifAddr->mAddress, sizeof(aMessageInfo->mSockAddr));
+    aMessageInfo->mSockAddr = netifAddr->GetAddress();
 
 exit:
     return error;
diff --git a/src/core/coap/coap_message.cpp b/src/core/coap/coap_message.cpp
index 5d03b9d9e..ba5fc572a 100644
--- a/src/core/coap/coap_message.cpp
+++ b/src/core/coap/coap_message.cpp
@@ -306,7 +306,7 @@ Message *Message::Clone(uint16_t aLength) const
 
     VerifyOrExit(message != nullptr, OT_NOOP);
 
-    memcpy(&message->GetHelpData(), &GetHelpData(), sizeof(GetHelpData()));
+    message->GetHelpData() = GetHelpData();
 
 exit:
     return message;
diff --git a/src/core/coap/coap_message.hpp b/src/core/coap/coap_message.hpp
index 87697c10a..912d0a61a 100644
--- a/src/core/coap/coap_message.hpp
+++ b/src/core/coap/coap_message.hpp
@@ -284,8 +284,8 @@ public:
      */
     bool IsTokenEqual(const Message &aMessage) const
     {
-        return ((this->GetTokenLength() == aMessage.GetTokenLength()) &&
-                (memcmp(this->GetToken(), aMessage.GetToken(), this->GetTokenLength()) == 0));
+        return ((GetTokenLength() == aMessage.GetTokenLength()) &&
+                (memcmp(GetToken(), aMessage.GetToken(), GetTokenLength()) == 0));
     }
 
     /**
diff --git a/src/core/thread/mle.cpp b/src/core/thread/mle.cpp
index bf331d651..98de82fd2 100644
--- a/src/core/thread/mle.cpp
+++ b/src/core/thread/mle.cpp
@@ -1522,7 +1522,7 @@ void Mle::HandleNotifierEvents(Events aEvents)
         Get<BackboneRouter::Leader>().Update();
 #endif
 #if OPENTHREAD_CONFIG_TMF_NETDATA_SERVICE_ENABLE
-        this->UpdateServiceAlocs();
+        UpdateServiceAlocs();
 #endif
 
 #if OPENTHREAD_CONFIG_DHCP6_SERVER_ENABLE