diff --git a/PKHeX.Core/Legality/Encounters/Generator/EncounterCriteria.cs b/PKHeX.Core/Legality/Encounters/Generator/EncounterCriteria.cs
index 517765bad..976ca3ac6 100644
--- a/PKHeX.Core/Legality/Encounters/Generator/EncounterCriteria.cs
+++ b/PKHeX.Core/Legality/Encounters/Generator/EncounterCriteria.cs
@@ -85,7 +85,7 @@ public int GetGender(int gender, PersonalInfo pkPersonalInfo)
 
         public int GetAbility(int abilityType, PersonalInfo pkPersonalInfo)
         {
-            if (abilityType < 3)
+            if ((uint)abilityType < 3)
                 return abilityType;
 
             var abils = pkPersonalInfo.Abilities;
diff --git a/PKHeX.Core/PKM/PKM.cs b/PKHeX.Core/PKM/PKM.cs
index 2a4c6e0b6..7b1637501 100644
--- a/PKHeX.Core/PKM/PKM.cs
+++ b/PKHeX.Core/PKM/PKM.cs
@@ -756,7 +756,7 @@ public void RefreshAbility(int n)
         {
             AbilityNumber = 1 << n;
             int[] abilities = PersonalInfo.Abilities;
-            if (n < abilities.Length)
+            if ((uint)n < abilities.Length)
             {
                 if (abilities[n] == abilities[0])
                     n = 0;