diff --git a/mirai-core/src/main/java/net/mamoe/mirai/network/protocol/tim/packet/Packet.kt b/mirai-core/src/main/java/net/mamoe/mirai/network/protocol/tim/packet/Packet.kt
index 1da431920..30128fcef 100644
--- a/mirai-core/src/main/java/net/mamoe/mirai/network/protocol/tim/packet/Packet.kt
+++ b/mirai-core/src/main/java/net/mamoe/mirai/network/protocol/tim/packet/Packet.kt
@@ -17,10 +17,6 @@ internal object PacketNameFormatter {
             return name
         }
 
-        return StringBuilder().apply {
-            repeat(longestNameLength - name.length) {
-                this.append(" ")
-            }
-        }.toString() + name
+        return " ".repeat(longestNameLength - name.length) + name
     }
 }
\ No newline at end of file