diff --git a/mirai-core-api/src/commonMain/kotlin/message/data/Voice.kt b/mirai-core-api/src/commonMain/kotlin/message/data/Voice.kt
index c24a600b8..7b354c85c 100644
--- a/mirai-core-api/src/commonMain/kotlin/message/data/Voice.kt
+++ b/mirai-core-api/src/commonMain/kotlin/message/data/Voice.kt
@@ -39,6 +39,7 @@ public class Voice @MiraiInternalApi constructor(
     public override val fileName: String,
     public override val md5: ByteArray,
     public override val fileSize: Long,
+    public val codec: Int = 0,
     private val _url: String
 ) : PttMessage() {
 
diff --git a/mirai-core/src/commonMain/kotlin/contact/GroupImpl.kt b/mirai-core/src/commonMain/kotlin/contact/GroupImpl.kt
index f9b2f1c30..9f052d6db 100644
--- a/mirai-core/src/commonMain/kotlin/contact/GroupImpl.kt
+++ b/mirai-core/src/commonMain/kotlin/contact/GroupImpl.kt
@@ -453,7 +453,7 @@ internal class GroupImpl(
                 response.fileKey,
                 codec
             )
-            Voice("${md5.toUHexString("")}.amr", md5, content.size.toLong(), "")
+            Voice("${md5.toUHexString("")}.amr", md5, content.size.toLong(), codec, "")
         }
 
     }
diff --git a/mirai-core/src/commonMain/kotlin/message/conversions.kt b/mirai-core/src/commonMain/kotlin/message/conversions.kt
index 807fd4085..203166d58 100644
--- a/mirai-core/src/commonMain/kotlin/message/conversions.kt
+++ b/mirai-core/src/commonMain/kotlin/message/conversions.kt
@@ -248,7 +248,7 @@ internal fun MsgComm.Msg.toMessageChain(
 //            4 -> Voice(String(fileName), fileMd5, fileSize.toLong(),String(downPara))
 //            else -> null
 //        }
-        Voice(String(fileName), fileMd5, fileSize.toLong(), String(downPara))
+        Voice(String(fileName), fileMd5, fileSize.toLong(), format, String(downPara))
     }
 
     return buildMessageChain(elements.size + 1 + if (pptMsg == null) 0 else 1) {
diff --git a/mirai-core/src/commonMain/kotlin/network/protocol/packet/chat/receive/MessageSvc.PbSendMsg.kt b/mirai-core/src/commonMain/kotlin/network/protocol/packet/chat/receive/MessageSvc.PbSendMsg.kt
index 95a6d04c9..5ea80c590 100644
--- a/mirai-core/src/commonMain/kotlin/network/protocol/packet/chat/receive/MessageSvc.PbSendMsg.kt
+++ b/mirai-core/src/commonMain/kotlin/network/protocol/packet/chat/receive/MessageSvc.PbSendMsg.kt
@@ -35,6 +35,7 @@ import net.mamoe.mirai.internal.utils.io.serialization.readProtoBuf
 import net.mamoe.mirai.internal.utils.io.serialization.writeProtoBuf
 import net.mamoe.mirai.message.data.MessageChain
 import net.mamoe.mirai.message.data.PttMessage
+import net.mamoe.mirai.message.data.Voice
 import net.mamoe.mirai.utils.currentTimeSeconds
 import kotlin.contracts.InvocationKind
 import kotlin.contracts.contract
@@ -145,7 +146,14 @@ internal object MessageSvcPbSendMsg : OutgoingPacketFactory<MessageSvcPbSendMsg.
                                 boolValid = true,
                                 fileSize = fileSize.toInt(),
                                 fileType = 4,
-                                pbReserve = byteArrayOf(0)
+                                pbReserve = byteArrayOf(0),
+                                format = let {
+                                    if (it is Voice) {
+                                        it.codec
+                                    } else {
+                                        0
+                                    }
+                                }
                             )
                         }
                     )