diff --git a/main.py b/main.py
index de5ef54..5a0a615 100644
--- a/main.py
+++ b/main.py
@@ -67,7 +67,8 @@ def on_click(self, cell):
         if not cell:
             return
         x, y = cell
-        self.board[x][y] = (self.board[x][y] + 1) % 2
+        if not self.drawing:
+            self.board[x][y] = (self.board[x][y] + 1) % 2
 
     def get_neighbours(self, x, y):
         def get(r, c):