diff --git a/src/backends/s3/create-s3-client.ts b/src/backends/s3/create-s3-client.ts
index d2b18ed..a0bdb04 100644
--- a/src/backends/s3/create-s3-client.ts
+++ b/src/backends/s3/create-s3-client.ts
@@ -32,5 +32,9 @@ export function createS3Client(uri: string): S3Client {
     process.env.AWS_ENDPOINT_URL_S3 ??
     process.env.AWS_ENDPOINT_URL;
 
+  if (config.endpoint) {
+    throw new Error(JSON.stringify(config));
+  }
+
   return new S3Client(config);
 }