diff --git a/grid.py b/grid.py
index fd3bbd3..baa20c0 100644
--- a/grid.py
+++ b/grid.py
@@ -96,7 +96,7 @@ class Grid:
         self.set(pos, self.get(pos) - value)
 
     def getActiveCells(self):
-        return [i for i in self.__grid.keys()]
+        return list(self.__grid.keys())
 
     def getSum(self, includeNegative: bool = True):
         grid_sum = 0