diff --git a/repo/object/object_manager.go b/repo/object/object_manager.go
index d04b4acb3..4f4ec2121 100644
--- a/repo/object/object_manager.go
+++ b/repo/object/object_manager.go
@@ -129,7 +129,7 @@ func (om *Manager) Concatenate(ctx context.Context, objectIDs []ID, metadataComp
 		}
 	}
 
-	log(ctx).Debugf("concatenated: %v total: %v", concatenatedEntries, totalLength)
+	log(ctx).Debugf("concatenated %d entries, total object length: %d", len(concatenatedEntries), totalLength)
 
 	w := om.NewWriter(ctx, WriterOptions{
 		Prefix:             indirectContentPrefix,