diff --git a/operator/CHANGELOG.md b/operator/CHANGELOG.md
index d504e4ee31b52..8dae6eced0bfa 100644
--- a/operator/CHANGELOG.md
+++ b/operator/CHANGELOG.md
@@ -1,5 +1,6 @@
 ## Main
 
+- [12008](https://github.com/grafana/loki/pull/12008) **xperimental**: Support using multiple buckets with AWS STS
 - [11964](https://github.com/grafana/loki/pull/11964) **xperimental**: Provide Azure region for managed credentials using environment variable
 - [11920](https://github.com/grafana/loki/pull/11920) **xperimental**: Refactor handling of credentials in managed-auth mode
 - [11869](https://github.com/grafana/loki/pull/11869) **periklis**: Add support for running with Google Workload Identity
diff --git a/operator/internal/manifests/internal/config/build_test.go b/operator/internal/manifests/internal/config/build_test.go
index 187dc6514202a..602672c813bf1 100644
--- a/operator/internal/manifests/internal/config/build_test.go
+++ b/operator/internal/manifests/internal/config/build_test.go
@@ -5436,7 +5436,8 @@ func TestBuild_ConfigAndRuntimeConfig_STS(t *testing.T) {
 	}
 	expStorageConfig := `
     s3:
-      s3: s3://my-region/my-bucket
+      bucketnames: my-bucket
+      region: my-region
       s3forcepathstyle: false`
 
 	expCfg := `
diff --git a/operator/internal/manifests/internal/config/loki-config.yaml b/operator/internal/manifests/internal/config/loki-config.yaml
index f908253a0c228..5d729eaffaf9e 100644
--- a/operator/internal/manifests/internal/config/loki-config.yaml
+++ b/operator/internal/manifests/internal/config/loki-config.yaml
@@ -29,7 +29,8 @@ common:
     {{- with .ObjectStorage.S3 }}
     s3:
       {{- if .STS }}
-      s3: "s3://{{.Region}}/{{.Buckets}}"
+      bucketnames: {{.Buckets}}
+      region: {{.Region}}
       s3forcepathstyle: false
       {{- else }}
       s3: {{ .Endpoint }}