diff --git a/PKHeX/PKM/PKM.cs b/PKHeX/PKM/PKM.cs
index b21da987c..113dc7899 100644
--- a/PKHeX/PKM/PKM.cs
+++ b/PKHeX/PKM/PKM.cs
@@ -301,7 +301,7 @@ public virtual string FileName
         {
             get
             {
-                string form = AltForm > 0 ? $"-{AltForm:00)}" : "";
+                string form = AltForm > 0 ? $"-{AltForm:00}" : "";
                 string star = IsShiny ? " ★" : "";
                 return $"{Species:000}{form}{star} - {Nickname} - {Checksum:X4}{EncryptionConstant:X8}.{Extension}";
             }