New class syntax.
diff --git a/Lib/lib-stdwin/Soundogram.py b/Lib/lib-stdwin/Soundogram.py
index aa2edd1..a68d4b3 100644
--- a/Lib/lib-stdwin/Soundogram.py
+++ b/Lib/lib-stdwin/Soundogram.py
@@ -3,7 +3,7 @@
 import audio
 from Histogram import Histogram
 
-class Soundogram() = Histogram():
+class Soundogram(Histogram):
 	#
 	def define(self, (win, chunk)):
 		width, height = corner = win.getwinsize()