diff --git a/PKHeX.Core/Saves/SAV4.cs b/PKHeX.Core/Saves/SAV4.cs
index 9c24045bb..5b6926875 100644
--- a/PKHeX.Core/Saves/SAV4.cs
+++ b/PKHeX.Core/Saves/SAV4.cs
@@ -1155,7 +1155,7 @@ public int[] MunchlaxTrees
 
         // Pokewalker
         private int OFS_WALKER = int.MinValue;
-        public void PokewalkerCoursesUnlockAll() => SetData(BitConverter.GetBytes((uint)0x7FFFFFFF), OFS_WALKER);
+        public void PokewalkerCoursesUnlockAll() => SetData(BitConverter.GetBytes((uint)0x07FF_FFFF), OFS_WALKER);
         public bool[] PokewalkerCoursesUnlocked
         {
             get