diff --git a/lib/src/Simulation.dart b/lib/src/Simulation.dart
index ddd6086..f3efd39 100644
--- a/lib/src/Simulation.dart
+++ b/lib/src/Simulation.dart
@@ -73,7 +73,7 @@ class Simulation {
   }
 
   void toggleCellState(int x, int y) {
-    map.get(x, y) == false ? map.set(x, y, true) : map.set(x, y, false);
+    map.set(x, y, !map.get(x, y));
   }
 
   Map<int, bool> update() {