diff --git a/app/src/main/java/io/legado/app/model/ImageProvider.kt b/app/src/main/java/io/legado/app/model/ImageProvider.kt
index 32c8ce74b..dfc035064 100644
--- a/app/src/main/java/io/legado/app/model/ImageProvider.kt
+++ b/app/src/main/java/io/legado/app/model/ImageProvider.kt
@@ -41,7 +41,7 @@ object ImageProvider {
     private const val M = 1024 * 1024
     val cacheSize: Int
         get() {
-            if (AppConfig.bitmapCacheSize <= 0 || AppConfig.bitmapCacheSize >= 2048) {
+            if (AppConfig.bitmapCacheSize !in 1..1024) {
                 AppConfig.bitmapCacheSize = 50
             }
             return AppConfig.bitmapCacheSize * M
diff --git a/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt b/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt
index 7fa758b4f..df2c93a30 100644
--- a/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt
@@ -126,7 +126,7 @@ class OtherConfigFragment : PreferenceFragment(),
             PreferKey.bitmapCacheSize -> {
                 NumberPickerDialog(requireContext())
                     .setTitle(getString(R.string.bitmap_cache_size))
-                    .setMaxValue(2047)
+                    .setMaxValue(1024)
                     .setMinValue(1)
                     .setValue(AppConfig.bitmapCacheSize)
                     .show {