diff --git a/app/src/main/java/io/legado/app/help/source/SourceVerificationHelp.kt b/app/src/main/java/io/legado/app/help/source/SourceVerificationHelp.kt
index 202b99d81..1573b3e75 100644
--- a/app/src/main/java/io/legado/app/help/source/SourceVerificationHelp.kt
+++ b/app/src/main/java/io/legado/app/help/source/SourceVerificationHelp.kt
@@ -29,6 +29,7 @@ object SourceVerificationHelp {
      * 获取书源验证结果
      * 图片验证码 防爬 滑动验证码 点击字符 等等
      */
+    @Synchronized
     fun getVerificationResult(
         source: BaseSource?,
         url: String,