1 files changed, 2 insertions, 0 deletions
diff --git a/src/bitboard.c b/src/bitboard.c
index ce994c5..8b9a83c 100644
--- a/src/bitboard.c
+++ b/src/bitboard.c
@@ -25,6 +25,7 @@ position_t position_starting() {
       (1 << BLACK_SHORT_CASTLE) |
       (1 << BLACK_LONG_CASTLE),
     .turn = WHITE_TURN,
+    .passantable_column = 0,
   };
 }
 
@@ -38,6 +39,7 @@ void assert_valid_position(position_t position) {
     )
   );
   assert(position.turn == WHITE_TURN || position.turn == BLACK_TURN);
+  assert(position.passantable_column <= 8);
 }
 
 bitboard_t whites(position_t position) {