diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/TypeConversion.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/TypeConversion.kt
index 75a93a88e..5e5f6973e 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/TypeConversion.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/TypeConversion.kt
@@ -21,6 +21,16 @@ import kotlin.random.nextInt
  * 这些函数为内部函数, 可能会改变
  */
 
+/**
+ * 255 -> 00 FF
+ */
+fun Short.toByteArray(): ByteArray = with(toInt()) {
+    byteArrayOf(
+        (shr(8) and 0xFF).toByte(),
+        (shr(0) and 0xFF).toByte()
+    )
+}
+
 /**
  * 255 -> 00 00 00 FF
  */