diff --git a/CHANGELOG.md b/CHANGELOG.md
index 60d9fa90..dba97687 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -44,4 +44,5 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 - [#65](https://github.com/thanos-io/objstore/pull/65) *: Upgrade minio-go version to `v7.0.61`.
 - [#70](https://github.com/thanos-io/objstore/pull/70) GCS: Update cloud.google.com/go/storage version to `v1.27.0`.
 - [#71](https://github.com/thanos-io/objstore/pull/71) Replace method `IsCustomerManagedKeyError` for a more generic `IsAccessDeniedErr` on the bucket interface.
+- [#88](https://github.com/thanos-io/objstore/pull/88) breaking :warning: GCS,S3,BOS: Remove thanos- prefix from the user agent
 ### Removed
diff --git a/providers/bos/bos.go b/providers/bos/bos.go
index 72e1b1e0..b7bb4a67 100644
--- a/providers/bos/bos.go
+++ b/providers/bos/bos.go
@@ -89,7 +89,7 @@ func NewBucketWithConfig(logger log.Logger, config Config, component string) (*B
 		return nil, errors.Wrap(err, "creating BOS client")
 	}
 
-	client.Config.UserAgent = fmt.Sprintf("thanos-%s", component)
+	client.Config.UserAgent = component
 
 	bkt := &Bucket{
 		logger: logger,
diff --git a/providers/gcs/gcs.go b/providers/gcs/gcs.go
index ad305d6e..66184c15 100644
--- a/providers/gcs/gcs.go
+++ b/providers/gcs/gcs.go
@@ -72,7 +72,7 @@ func NewBucketWithConfig(ctx context.Context, logger log.Logger, gc Config, comp
 	}
 
 	opts = append(opts,
-		option.WithUserAgent(fmt.Sprintf("thanos-%s/%s (%s)", component, version.Version, runtime.Version())),
+		option.WithUserAgent(fmt.Sprintf("%s/%s (%s)", component, version.Version, runtime.Version())),
 	)
 
 	gcsClient, err := storage.NewClient(ctx, opts...)
diff --git a/providers/s3/s3.go b/providers/s3/s3.go
index 507b550b..c2e96b36 100644
--- a/providers/s3/s3.go
+++ b/providers/s3/s3.go
@@ -272,7 +272,7 @@ func NewBucketWithConfig(logger log.Logger, config Config, component string) (*B
 	if err != nil {
 		return nil, errors.Wrap(err, "initialize s3 client")
 	}
-	client.SetAppInfo(fmt.Sprintf("thanos-%s", component), fmt.Sprintf("%s (%s)", version.Version, runtime.Version()))
+	client.SetAppInfo(component, fmt.Sprintf("%s (%s)", version.Version, runtime.Version()))
 
 	var sse encrypt.ServerSide
 	if config.SSEConfig.Type != "" {