diff --git a/flow/audioiosndio.cpp b/flow/audioiosndio.cpp
index 03efd1b..cfbdf10 100644
--- a/flow/audioiosndio.cpp
+++ b/flow/audioiosndio.cpp
@@ -35,6 +35,7 @@
 
 #include <cstdlib>
 #include <cstring>
+#include <climits>
 
 int bps, chans;
 long long realpos, playpos, recpos;
@@ -155,7 +156,7 @@ bool AudioIOSNDIO::open()
 	while (_fragmentSize * _fragmentCount > 1024*32)
 		_fragmentCount--;
 
-	bpf = ((par.bits / NBBY) * par.pchan);
+	bpf = ((par.bits / CHAR_BIT) * par.pchan);
 	par.round = _fragmentSize / bpf;
 	par.appbufsz = _fragmentSize * _fragmentCount / bpf;