diff --git a/src/cli/cli.cpp b/src/cli/cli.cpp
index b5aa4a905..284ff6f42 100644
--- a/src/cli/cli.cpp
+++ b/src/cli/cli.cpp
@@ -790,7 +790,6 @@ void Interpreter::ProcessDns(int argc, char *argv[])
 
         strcpy(mResolvingHostname, argv[1]);
 
-        memset(&messageInfo, 0, sizeof(messageInfo));
         messageInfo.mInterfaceId = OT_NETIF_INTERFACE_ID_THREAD;
 
         if (argc > 2)
@@ -1771,7 +1770,6 @@ void Interpreter::ProcessPing(int argc, char *argv[])
 
     VerifyOrExit(!mPingTimer.IsRunning(), error = OT_ERROR_BUSY);
 
-    memset(&mMessageInfo, 0, sizeof(mMessageInfo));
     SuccessOrExit(error = mMessageInfo.GetPeerAddr().FromString(argv[0]));
     mMessageInfo.mInterfaceId = OT_NETIF_INTERFACE_ID_THREAD;
 
diff --git a/src/core/net/dhcp6_client.cpp b/src/core/net/dhcp6_client.cpp
index 71c1822b8..9aae866cb 100644
--- a/src/core/net/dhcp6_client.cpp
+++ b/src/core/net/dhcp6_client.cpp
@@ -387,7 +387,6 @@ otError Dhcp6Client::Solicit(uint16_t aRloc16)
     SuccessOrExit(error = AppendIaAddress(*message, aRloc16));
     SuccessOrExit(error = AppendRapidCommit(*message));
 
-    memset(&messageInfo, 0, sizeof(messageInfo));
     memcpy(messageInfo.GetPeerAddr().mFields.m8, netif.GetMle().GetMeshLocalPrefix(), 8);
     messageInfo.GetPeerAddr().mFields.m16[4] = HostSwap16(0x0000);
     messageInfo.GetPeerAddr().mFields.m16[5] = HostSwap16(0x00ff);
diff --git a/src/core/net/dhcp6_server.cpp b/src/core/net/dhcp6_server.cpp
index e5f63d929..d9796df0b 100644
--- a/src/core/net/dhcp6_server.cpp
+++ b/src/core/net/dhcp6_server.cpp
@@ -429,7 +429,6 @@ otError Dhcp6Server::SendReply(otIp6Address &aDst, uint8_t *aTransactionId, Clie
     SuccessOrExit(error = AppendIaAddress(*message, aClient));
     SuccessOrExit(error = AppendRapidCommit(*message));
 
-    memset(&messageInfo, 0, sizeof(messageInfo));
     memcpy(messageInfo.GetPeerAddr().mFields.m8, &aDst, sizeof(otIp6Address));
     messageInfo.mPeerPort = kDhcpClientPort;
     SuccessOrExit(error = mSocket.SendTo(*message, messageInfo));