diff --git a/water_sim.py b/water_sim.py
index 199da08..239fe13 100644
--- a/water_sim.py
+++ b/water_sim.py
@@ -22,7 +22,7 @@ class WaterSim(Game):
         elif event.type == MOUSEMOTION:
             self.mousepos = event.pos[:]
         else:
-            super(Sim, self).on_event(event)
+            super(WaterSim, self).on_event(event)
 
     def on_update(self, dtime):
         C2 = [0] * self.N