diff --git a/library/build.gradle b/library/build.gradle
index 7930b94..cc1edda 100644
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -13,7 +13,7 @@ android {
         minSdkVersion 15
         targetSdkVersion 26
         versionCode 1
-        versionName "1.0"
+        versionName "0.0.1"
 
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
diff --git a/sample/src/main/java/me/baleen/sharedpreferencedelegate/UserPreference.kt b/sample/src/main/java/me/baleen/sharedpreferencedelegate/UserPreference.kt
index 9bde3b4..d90d3dc 100644
--- a/sample/src/main/java/me/baleen/sharedpreferencedelegate/UserPreference.kt
+++ b/sample/src/main/java/me/baleen/sharedpreferencedelegate/UserPreference.kt
@@ -4,7 +4,7 @@ package me.baleen.sharedpreferencedelegate
  * Created by baleen37 on 09/08/2017.
  */
 class UserPreference : PreferenceUtil() {
-    var email by StringPref("unknown")
+    var email by StringPref(defaultValue = "unknown")
     var age by IntPref("PREF_AGE")
     var male by BooleanPref(defaultValue = false)
     var score by FloatPref()