diff --git a/app/src/main/java/io/legado/app/lib/theme/ThemeStore.kt b/app/src/main/java/io/legado/app/lib/theme/ThemeStore.kt
index b3605e3e9..5335a6830 100644
--- a/app/src/main/java/io/legado/app/lib/theme/ThemeStore.kt
+++ b/app/src/main/java/io/legado/app/lib/theme/ThemeStore.kt
@@ -15,7 +15,7 @@ import io.legado.app.R
  * @author Aidan Follestad (afollestad), Karim Abou Zeid (kabouzeid)
  */
 class ThemeStore @SuppressLint("CommitPrefEdits")
-private constructor(private val mContext: Context) : ThemeStorePrefKeys, ThemeStoreInterface {
+private constructor(private val mContext: Context) : ThemeStoreInterface {
     private val mEditor: SharedPreferences.Editor
 
     init {
diff --git a/app/src/main/java/io/legado/app/lib/theme/ThemeStorePrefKeys.kt b/app/src/main/java/io/legado/app/lib/theme/ThemeStorePrefKeys.kt
index 4fd4540fc..c934ef176 100644
--- a/app/src/main/java/io/legado/app/lib/theme/ThemeStorePrefKeys.kt
+++ b/app/src/main/java/io/legado/app/lib/theme/ThemeStorePrefKeys.kt
@@ -3,8 +3,7 @@ package io.legado.app.lib.theme
 /**
  * @author Aidan Follestad (afollestad), Karim Abou Zeid (kabouzeid)
  */
-internal interface ThemeStorePrefKeys {
-    companion object {
+object ThemeStorePrefKeys {
 
         const val CONFIG_PREFS_KEY_DEFAULT = "app_themes"
         const val IS_CONFIGURED_KEY = "is_configured"
@@ -27,5 +26,4 @@ internal interface ThemeStorePrefKeys {
         const val KEY_APPLY_PRIMARYDARK_STATUSBAR = "apply_primarydark_statusbar"
         const val KEY_APPLY_PRIMARY_NAVBAR = "apply_primary_navbar"
         const val KEY_AUTO_GENERATE_PRIMARYDARK = "auto_generate_primarydark"
-    }
 }
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