diff --git a/src/core/api/ip6_api.cpp b/src/core/api/ip6_api.cpp
index 68fd48c58..524a32a2f 100644
--- a/src/core/api/ip6_api.cpp
+++ b/src/core/api/ip6_api.cpp
@@ -211,7 +211,7 @@ otMessage *otIp6NewMessage(otInstance *aInstance, const otMessageSettings *aSett
         VerifyOrExit(aSettings->mPriority <= OT_MESSAGE_PRIORITY_HIGH, message = NULL);
     }
 
-    message = instance.GetMessagePool().New(Message::kTypeIp6, 0, aSettings);
+    message = instance.GetIp6().NewMessage(0, aSettings);
 
 exit:
     return message;
diff --git a/src/core/api/udp_api.cpp b/src/core/api/udp_api.cpp
index b1e2a54e6..11fda2255 100644
--- a/src/core/api/udp_api.cpp
+++ b/src/core/api/udp_api.cpp
@@ -50,7 +50,7 @@ otMessage *otUdpNewMessage(otInstance *aInstance, const otMessageSettings *aSett
         VerifyOrExit(aSettings->mPriority <= OT_MESSAGE_PRIORITY_HIGH, message = NULL);
     }
 
-    message = instance.GetMessagePool().New(Message::kTypeIp6, 0, aSettings);
+    message = instance.GetIp6().GetUdp().NewMessage(0, aSettings);
 
 exit:
     return message;