diff --git a/utils/src/main/java/one/nem/lacerta/utils/impl/SharedPrefUtilsImpl.java b/utils/src/main/java/one/nem/lacerta/utils/impl/SharedPrefUtilsImpl.java
index f32b9733..f67760be 100644
--- a/utils/src/main/java/one/nem/lacerta/utils/impl/SharedPrefUtilsImpl.java
+++ b/utils/src/main/java/one/nem/lacerta/utils/impl/SharedPrefUtilsImpl.java
@@ -1,4 +1,4 @@
 package one.nem.lacerta.utils.impl;
 
-public class SharedPrefUtilsImpl {
+public interface SharedPrefUtilsImpl {
 }