diff --git a/src/bin/predprey/main.rs b/src/bin/predprey/main.rs
index 2ba9fbe..6b3f1de 100644
--- a/src/bin/predprey/main.rs
+++ b/src/bin/predprey/main.rs
@@ -74,7 +74,7 @@ fn grow(board: &Board, pos: Point2d, grow: Square, die: Square) -> Square {
     for dir in Vec2d::directions() {
         let pos1 = pos + dir;
         if board.rect().contains(pos1) {
-            let neigh_sq = board.get(pos);
+            let neigh_sq = board.get(pos1);
             if neigh_sq == grow {
                 return grow;
             }