diff --git a/sipsi-8.py b/sipsi-8.py
index 7c5f4b8..b951f1a 100644
--- a/sipsi-8.py
+++ b/sipsi-8.py
@@ -401,7 +401,7 @@ def tick_timers():
 	if sound_timer > 0:
 		# sound_timer is in the unit of 1/60th of a second, while
 		# Square takes length in seconds
-		pyglet.media.procedural.Square(sound_timer/60).play()
+		pyglet.media.synthesis.Square(sound_timer/60).play()
 		sound_timer = 0
 
 def advance_interpreter(dt):