diff --git a/simulator.py b/simulator.py
index d816fc7..950dc30 100755
--- a/simulator.py
+++ b/simulator.py
@@ -111,6 +111,8 @@ class Douche:
         ax = self.fig.add_subplot(111)
         self.xs = []
         self.ys = []
+        ax.set_xlim([0, 300])
+        ax.set_ylim([0, 300])
         self.line, = ax.plot(self.xs, self.ys)
 
     def add_point(self, x, y):