diff --git a/app/src/main/java/io/legado/app/ui/main/explore/ExploreAdapter.kt b/app/src/main/java/io/legado/app/ui/main/explore/ExploreAdapter.kt
index 15c4ecfdb..205cf4e2c 100644
--- a/app/src/main/java/io/legado/app/ui/main/explore/ExploreAdapter.kt
+++ b/app/src/main/java/io/legado/app/ui/main/explore/ExploreAdapter.kt
@@ -24,7 +24,7 @@ import org.jetbrains.anko.sdk27.listeners.onLongClick
 class ExploreAdapter(context: Context, private val scope: CoroutineScope, val callBack: CallBack) :
     SimpleRecyclerAdapter<BookSource>(context, R.layout.item_find_book) {
 
-    var exIndex = 0
+    private var exIndex = 0
 
     override fun convert(holder: ItemViewHolder, item: BookSource, payloads: MutableList<Any>) {
         with(holder.itemView) {