diff --git a/mirai-core-api/src/commonMain/kotlin/contact/ContactList.kt b/mirai-core-api/src/commonMain/kotlin/contact/ContactList.kt
index cf494caa7..ccac2bfe6 100644
--- a/mirai-core-api/src/commonMain/kotlin/contact/ContactList.kt
+++ b/mirai-core-api/src/commonMain/kotlin/contact/ContactList.kt
@@ -44,5 +44,11 @@ internal constructor(@JvmField @MiraiInternalApi public val delegate: Concurrent
  * [123456, 321654, 123654]
  * ```
  */
+@Deprecated(
+    "deprecated.",
+    ReplaceWith("\"[\" + delegate.joinToString { it.id.toString() } + \"]\""),
+    DeprecationLevel.ERROR
+)
+@PlannedRemoval("2.0.0")
 public val ContactList<*>.idContentString: String
     get() = "[" + delegate.joinToString { it.id.toString() } + "]"
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