diff --git a/app/src/main/java/io/legado/app/help/ReadBookConfig.kt b/app/src/main/java/io/legado/app/help/ReadBookConfig.kt
index 48c9bc27b..915ea9f5a 100644
--- a/app/src/main/java/io/legado/app/help/ReadBookConfig.kt
+++ b/app/src/main/java/io/legado/app/help/ReadBookConfig.kt
@@ -9,7 +9,6 @@ import io.legado.app.utils.*
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
-import okhttp3.internal.toHexString
 import java.io.BufferedWriter
 import java.io.File
 import java.io.FileWriter
@@ -126,9 +125,9 @@ object ReadBookConfig {
 
         fun setTextColor(color: Int) {
             if (App.INSTANCE.isNightTheme) {
-                textColorNight = "#${color.toHexString()}"
+                textColorNight = "#${color.hexString}"
             } else {
-                textColor = "#${color.toHexString()}"
+                textColor = "#${color.hexString}"
             }
         }
 
diff --git a/app/src/main/java/io/legado/app/utils/IntExtensions.kt b/app/src/main/java/io/legado/app/utils/IntExtensions.kt
index 11946c14a..2354a6a78 100644
--- a/app/src/main/java/io/legado/app/utils/IntExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/IntExtensions.kt
@@ -10,4 +10,7 @@ val Int.dp: Int
 val Int.sp: Int
     get() = android.util.TypedValue.applyDimension(
         android.util.TypedValue.COMPLEX_UNIT_SP, this.toFloat(), Resources.getSystem().displayMetrics
-    ).toInt()
\ No newline at end of file
+    ).toInt()
+
+val Int.hexString: String
+    get() = Integer.toHexString(this)
\ No newline at end of file