diff --git a/anki/sound.py b/anki/sound.py
index 9943a83b7..2272bd2b2 100644
--- a/anki/sound.py
+++ b/anki/sound.py
@@ -238,7 +238,7 @@ try:
     PYAU_FORMAT = pyaudio.paInt16
     PYAU_CHANNELS = 1
     PYAU_RATE = 44100
-    PYAU_INPUT_INDEX = 0
+    PYAU_INPUT_INDEX = None
 except:
     pass