diff --git a/docs/modules/ROOT/pages/tmail-backend/configure/index.adoc b/docs/modules/ROOT/pages/tmail-backend/configure/index.adoc
index a61e0216cd..ec0bc05507 100644
--- a/docs/modules/ROOT/pages/tmail-backend/configure/index.adoc
+++ b/docs/modules/ROOT/pages/tmail-backend/configure/index.adoc
@@ -209,6 +209,8 @@ Specified to TMail backend, we can configure the following configurations in the
 | S3 service endpoint
 | objectstorage.s3.secondary.region
 | S3 region
+| objectstorage.s3.secondary.bucketPrefix
+| The prefix of bucket names for the secondary blob store.
 | objectstorage.s3.secondary.accessKeyId
 | https://docs.aws.amazon.com/general/latest/gr/aws-sec-cred-types.html#access-keys-and-secret-access-keys[S3 access key id]
 | objectstorage.s3.secondary.secretKey
diff --git a/tmail-backend/guice/blob-guice/src/main/java/com/linagora/tmail/blob/guice/SecondaryS3BlobStoreConfigurationReader.java b/tmail-backend/guice/blob-guice/src/main/java/com/linagora/tmail/blob/guice/SecondaryS3BlobStoreConfigurationReader.java
index 79b77991fb..08cd6fa141 100644
--- a/tmail-backend/guice/blob-guice/src/main/java/com/linagora/tmail/blob/guice/SecondaryS3BlobStoreConfigurationReader.java
+++ b/tmail-backend/guice/blob-guice/src/main/java/com/linagora/tmail/blob/guice/SecondaryS3BlobStoreConfigurationReader.java
@@ -20,7 +20,7 @@
 
 public class SecondaryS3BlobStoreConfigurationReader {
     private static final String OBJECTSTORAGE_NAMESPACE = "objectstorage.namespace";
-    private static final String OBJECTSTORAGE_BUCKET_PREFIX = "objectstorage.bucketPrefix";
+    private static final String OBJECTSTORAGE_BUCKET_PREFIX = "objectstorage.s3.secondary.bucketPrefix";
     private static final String OBJECTSTORAGE_S3_REGION = "objectstorage.s3.secondary.region";
     private static final String OBJECTSTORAGE_S3_HTTP_CONCURRENCY = "objectstorage.s3.http.concurrency";
     private static final String OBJECTSTORAGE_S3_READ_TIMEOUT = "objectstorage.s3.read.timeout";