diff --git a/NEWS b/NEWS
index b11108401..b9057693d 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,6 @@
 ver 0.20.17 (not yet released)
+* output
+  - alsa: fix crash bug with 8 channels
 * fix real-time and idle scheduling with Musl
 
 ver 0.20.16 (2018/02/03)
diff --git a/src/pcm/Order.cxx b/src/pcm/Order.cxx
index 1812b14dd..736eb472d 100644
--- a/src/pcm/Order.cxx
+++ b/src/pcm/Order.cxx
@@ -88,7 +88,7 @@ static inline ConstBuffer<V>
 ToAlsaChannelOrder71(PcmBuffer &buffer, ConstBuffer<V> src)
 {
 	auto dest = buffer.GetT<V>(src.size);
-	ToAlsaChannelOrder71(dest, src.data, src.size / 6);
+	ToAlsaChannelOrder71(dest, src.data, src.size / 8);
 	return { dest, src.size };
 }