diff --git a/position/pieceid.h b/position/pieceid.h
index 93e012198..f90153555 100644
--- a/position/pieceid.h
+++ b/position/pieceid.h
@@ -8,7 +8,7 @@ enum
 {
   NullPieceId = 0,
   MinPieceId = 1,
-  MaxPieceId = 127
+  MaxPieceId = 64
 };
 
 typedef unsigned long       PieceIdType;