diff --git a/cfg-mplayer.h b/cfg-mplayer.h
index b74ed54940..ddf180fbaa 100644
--- a/cfg-mplayer.h
+++ b/cfg-mplayer.h
@@ -109,7 +109,7 @@ struct config ao_plugin_conf[]={
 	{"format", &ao_plugin_cfg.pl_format_type, CONF_TYPE_INT, CONF_MIN, 0, 0, NULL},
 	{"fout", &ao_plugin_cfg.pl_resample_fout, CONF_TYPE_INT, CONF_MIN, 0, 0, NULL},
 	{"volume", &ao_plugin_cfg.pl_volume_volume, CONF_TYPE_INT, CONF_RANGE, 0, 255, NULL},
-	{"mul", &ao_plugin_cfg.pl_extrastereo_mul, CONF_TYPE_FLOAT, CONF_MIN, 0, 0, NULL},
+	{"mul", &ao_plugin_cfg.pl_extrastereo_mul, CONF_TYPE_FLOAT, CONF_RANGE, -10.0, 10.0, NULL},
 	{"softclip", &ao_plugin_cfg.pl_volume_softclip, CONF_TYPE_FLAG, 0, 0, 1, NULL},
 	{NULL, NULL, 0, 0, 0, 0, NULL}
 };