diff --git a/utils/src/main/java/one/nem/lacerta/utils/repository/DeviceInfoUtils.java b/utils/src/main/java/one/nem/lacerta/utils/repository/DeviceInfoUtils.java
index 46aacc18..5a21b1ad 100644
--- a/utils/src/main/java/one/nem/lacerta/utils/repository/DeviceInfoUtils.java
+++ b/utils/src/main/java/one/nem/lacerta/utils/repository/DeviceInfoUtils.java
@@ -7,8 +7,12 @@ public interface DeviceInfoUtils {
     // External storage directory
     Path getExternalStorageDirectory();
 
+    String getExternalStorageDirectoryString();
+
     Path getExternalStorageDirectory(String type);
 
+    String getExternalStorageDirectoryString(String type);
+
     // Permission
     boolean hasPermission(String permission);