diff --git a/aws/rust-runtime/aws-types/external-types.toml b/aws/rust-runtime/aws-types/external-types.toml
index 640a363e7d..7aff945fd6 100644
--- a/aws/rust-runtime/aws-types/external-types.toml
+++ b/aws/rust-runtime/aws-types/external-types.toml
@@ -6,6 +6,7 @@ allowed_external_types = [
     "aws_smithy_http::endpoint::Endpoint",
     "aws_smithy_http::endpoint::EndpointPrefix",
     "aws_smithy_http::endpoint::error::InvalidEndpointError",
+    "aws_smithy_types::auth::AuthApiKey",
     "aws_smithy_types::retry::RetryConfig",
     "aws_smithy_types::timeout::TimeoutConfig",
     "http::uri::Uri",