diff --git a/src/lib/chess/types.ts b/src/lib/chess/types.ts
index e033ad7..7f943e9 100644
--- a/src/lib/chess/types.ts
+++ b/src/lib/chess/types.ts
@@ -12,8 +12,8 @@ export enum Piece {
   PAWN = 6,
 
   // bit 3: color (0-1)
-  WHITE = 0,
-  BLACK = 8,
+  WHITE = 0<<3,
+  BLACK = 1<<3,
 }
 
 export const CHAR_TO_PIECE: Record<string, number> = {