diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/Annotations.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/Annotations.kt
index d79f63635..9a0d23602 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/Annotations.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/Annotations.kt
@@ -36,7 +36,7 @@ annotation class CorrespondingEvent(
  */
 @MustBeDocumented
 @Target(AnnotationTarget.FUNCTION, AnnotationTarget.CLASS, AnnotationTarget.PROPERTY)
-@Retention(AnnotationRetention.BINARY)
+@Retention(AnnotationRetention.SOURCE)
 internal annotation class PacketVersion(val date: String, val timVersion: String)
 
 /**