diff --git a/mirai-core/src/commonMain/kotlin/message/protocol/impl/CustomMessageProtocol.kt b/mirai-core/src/commonMain/kotlin/message/protocol/impl/CustomMessageProtocol.kt
index 6b40b296e..230c51e44 100644
--- a/mirai-core/src/commonMain/kotlin/message/protocol/impl/CustomMessageProtocol.kt
+++ b/mirai-core/src/commonMain/kotlin/message/protocol/impl/CustomMessageProtocol.kt
@@ -40,7 +40,7 @@ internal class CustomMessageProtocol : MessageProtocol() {
         }
 
         private companion object {
-            private val MIRAI_CUSTOM_ELEM_TYPE = "mirai".hashCode() // 103904510
+            private const val MIRAI_CUSTOM_ELEM_TYPE = 103904510 // "mirai.hashCode()"
         }
     }