diff --git a/src/plugins/pulse/ao_pulse.c b/src/plugins/pulse/ao_pulse.c
index ff5497f..9c0f64a 100644
--- a/src/plugins/pulse/ao_pulse.c
+++ b/src/plugins/pulse/ao_pulse.c
@@ -259,7 +259,7 @@ int ao_plugin_open(ao_device *device, ao_sample_format *format) {
     battr.prebuf = battr.minreq = battr.fragsize = -1;
 
     battr.tlength = (int)(internal->buffer_time * format->rate) / 1000000 *
-      ((format->bits+7)/8) + device->output_channels;
+      ((format->bits+7)/8) * device->output_channels;
     battr.minreq = battr.tlength/4;
     battr.maxlength = battr.tlength+battr.minreq;