diff --git a/lib/droonga/catalog/version2.rb b/lib/droonga/catalog/version2.rb
index f09248a1..11bb4a33 100644
--- a/lib/droonga/catalog/version2.rb
+++ b/lib/droonga/catalog/version2.rb
@@ -44,9 +44,10 @@ def slices(node)
             volume.slices.each do |slice|
               volume_address = slice.volume.address
               if volume_address.node == node
-                migrate_database_location(device, volume_address.name)
+                name = volume_address.name
+                migrate_database_location(device, name)
 
-                path = File.join([device, Path.databases.basename.to_s, volume_address.name, "db"])
+                path = File.join([device, Path.databases.basename.to_s, name, "db"])
                 path = Pathname(path).expand_path(base_path)
                 options = {
                   :dataset => dataset_name,