diff --git a/PKHeX.Core/Legality/Checks.cs b/PKHeX.Core/Legality/Checks.cs
index db4602b88..9c7d1a04e 100644
--- a/PKHeX.Core/Legality/Checks.cs
+++ b/PKHeX.Core/Legality/Checks.cs
@@ -419,7 +419,7 @@ private void VerifyTradeOTOnly(string[] validOT)
             if (pkm.IsNicknamed)
                 AddLine(Severity.Invalid, V9, CheckIdentifier.Nickname);
             int lang = pkm.Language;
-            if (validOT.Length >= lang)
+            if (validOT.Length <= lang)
                 AddLine(Severity.Invalid, V8, CheckIdentifier.Trainer);
             else if (validOT[lang] != pkm.OT_Name)
                 AddLine(Severity.Invalid, V10, CheckIdentifier.Trainer);