diff --git a/lib/src/Simulation.dart b/lib/src/Simulation.dart
index a3f99c5..90969ce 100644
--- a/lib/src/Simulation.dart
+++ b/lib/src/Simulation.dart
@@ -87,7 +87,7 @@ class Simulation {
     for (int i = 0; i < map.length; i++) {
       math.Point p = map.toCoordinates(i);
       bool cell = map[i];
-      int neighbors = getNeighbors(p.x, p.y, 1);
+      int neighbors = getNeighbors(p.x, p.y, rules.range);
       if (cell == false && rules.checkBirth(neighbors) == true) {
         stateChanges[i] = true;
       } else if (cell == true && rules.checkSurvival(neighbors) == false) {