diff --git a/app/src/main/java/io/legado/app/utils/BitmapUtils.kt b/app/src/main/java/io/legado/app/utils/BitmapUtils.kt
index c237deba7..e2407c95e 100644
--- a/app/src/main/java/io/legado/app/utils/BitmapUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/BitmapUtils.kt
@@ -53,13 +53,13 @@ object BitmapUtils {
         height: Int? = null
     ): Int {
         //获取比例大小
-        val wRatio = width?.let { ceil((options.outWidth / it).toDouble()).toInt() } ?: -1
-        val hRatio = height?.let { ceil((options.outHeight / it).toDouble()).toInt() } ?: -1
+        val wRatio = width?.let { ceil((options.outWidth / it.toFloat())).toInt() } ?: -1
+        val hRatio = height?.let { ceil((options.outHeight / it.toFloat())).toInt() } ?: -1
         //如果超出指定大小，则缩小相应的比例
         return when {
             wRatio > 1 && hRatio > 1 -> max(wRatio, hRatio)
             wRatio > 1 -> wRatio
-            hRatio > 1  -> hRatio
+            hRatio > 1 -> hRatio
             else -> 1
         }
     }