diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Group.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Group.kt
index 4292f0978..2a3084c1b 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Group.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Group.kt
@@ -5,6 +5,7 @@ package net.mamoe.mirai.contact
 import kotlinx.coroutines.CoroutineScope
 import net.mamoe.mirai.network.protocol.tim.packet.action.GroupInfo
 import net.mamoe.mirai.network.protocol.tim.packet.action.QuitGroupResponse
+import net.mamoe.mirai.utils.MiraiExperimentalAPI
 import net.mamoe.mirai.utils.internal.PositiveNumbers
 import net.mamoe.mirai.utils.internal.coerceAtLeastOrFail
 
@@ -17,7 +18,7 @@ import net.mamoe.mirai.utils.internal.coerceAtLeastOrFail
  * - Group ID([Group.internalId]) 是与调用 API 时使用的 id.(在 QQ 客户端中不可见)
  * @author Him188moe
  */
-interface Group : Contact, CoroutineScope, Iterable<Member>/*, Map<UInt, Member>*/ { // TODO: 2019/12/4 在 inline 稳定后实现 Map<UInt, Member>. 目前这样做会导致问题
+interface Group : Contact, CoroutineScope/*, Map<UInt, Member>*/ { // TODO: 2019/12/4 在 inline 稳定后实现 Map<UInt, Member>. 目前这样做会导致问题
     /**
      * 内部 ID. 内部 ID 为 [GroupId] 的映射
      */
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/internal/ContactImpl.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/internal/ContactImpl.kt
index 2701cf337..e9350c0c2 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/internal/ContactImpl.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/internal/ContactImpl.kt
@@ -15,6 +15,7 @@ import net.mamoe.mirai.network.qqAccount
 import net.mamoe.mirai.network.sessionKey
 import net.mamoe.mirai.qqAccount
 import net.mamoe.mirai.sendPacket
+import net.mamoe.mirai.utils.MiraiExperimentalAPI
 import net.mamoe.mirai.utils.MiraiInternalAPI
 import net.mamoe.mirai.utils.io.logStacktrace
 import net.mamoe.mirai.withSession
@@ -85,8 +86,6 @@ internal data class GroupImpl internal constructor(override val bot: Bot, val gr
     }
 
     override fun toString(): String = "Group(${this.id})"
-
-    override fun iterator(): Iterator<Member> = members.values.iterator()
 }
 
 @Suppress("FunctionName")