diff --git a/utils/src/main/java/one/nem/lacerta/utils/repository/SharedPrefUtils.java b/utils/src/main/java/one/nem/lacerta/utils/repository/SharedPrefUtils.java
index 9ba40fd7..b369b44a 100644
--- a/utils/src/main/java/one/nem/lacerta/utils/repository/SharedPrefUtils.java
+++ b/utils/src/main/java/one/nem/lacerta/utils/repository/SharedPrefUtils.java
@@ -1,4 +1,4 @@
 package one.nem.lacerta.utils.repository;
 
-public class SharedPrefUtils {
+public interface SharedPrefUtils {
 }