diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/InputUtils.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/InputUtils.kt
index d96845200..e080637b6 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/InputUtils.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/io/InputUtils.kt
@@ -141,7 +141,7 @@ fun Map<UInt, ByteArray>.printTLVMap(name: String = "", keyLength: Int = 1) =
     })
 
 @Suppress("NOTHING_TO_INLINE")
-internal inline fun unsupported(): Nothing = error("Unsupported")
+internal inline fun unsupported(message: String? = null): Nothing = error(message ?: "Unsupported")
 
 @Suppress("NOTHING_TO_INLINE")
 internal inline fun illegalArgument(message: String? = null): Nothing = error(message ?: "Illegal argument passed")