diff --git a/src/aws-cpp-sdk-core/source/client/CoreErrors.cpp b/src/aws-cpp-sdk-core/source/client/CoreErrors.cpp
index c07f242ca26..f1366e9f342 100644
--- a/src/aws-cpp-sdk-core/source/client/CoreErrors.cpp
+++ b/src/aws-cpp-sdk-core/source/client/CoreErrors.cpp
@@ -76,6 +76,7 @@ void CoreErrorsMapper::InitCoreErrorsMapper()
     s_CoreErrorsMapper->emplace("ValidationError", AWSError<CoreErrors>(CoreErrors::VALIDATION, false));
     s_CoreErrorsMapper->emplace("AccessDeniedException", AWSError<CoreErrors>(CoreErrors::ACCESS_DENIED, false));
     s_CoreErrorsMapper->emplace("AccessDenied", AWSError<CoreErrors>(CoreErrors::ACCESS_DENIED, false));
+    s_CoreErrorsMapper->emplace("AuthenticationRequired", AWSError<CoreErrors>(CoreErrors::ACCESS_DENIED, false));
     s_CoreErrorsMapper->emplace("ResourceNotFoundException", AWSError<CoreErrors>(CoreErrors::RESOURCE_NOT_FOUND, false));
     s_CoreErrorsMapper->emplace("ResourceNotFound", AWSError<CoreErrors>(CoreErrors::RESOURCE_NOT_FOUND, false));
     s_CoreErrorsMapper->emplace("UnrecognizedClientException", AWSError<CoreErrors>(CoreErrors::UNRECOGNIZED_CLIENT, false));