diff --git a/src/cam_parser.py b/src/cam_parser.py
index f04c881..76e70a4 100644
--- a/src/cam_parser.py
+++ b/src/cam_parser.py
@@ -99,7 +99,7 @@ class CAMParser:
         """
         x, y = list(map(int, x)), list(map(int, y))
         def next_state(plane, neighborhood, *args):
-            if plane.grid.flat[neighborhood.flat_index]:
+            if plane.grid.flat[neighborhood.flat_index][neighborhood.bit_index]:
                 return int(neighborhood.total in x)
             else:
                 return int(neighborhood.total in y)