diff --git a/s/cron/previews.sh b/s/cron/previews.sh
index 7c9f8bb95..809ea56c2 100755
--- a/s/cron/previews.sh
+++ b/s/cron/previews.sh
@@ -1,7 +1,12 @@
 #!/bin/sh
 [ -z $ERESSEA ] && ERESSEA=$HOME/eressea
+
+branch=master
+if [ ! -n "$1" ]; then
+branch="$1"
+fi
 SRC=$ERESSEA/git
-$SRC/s/preview build master
+$SRC/s/preview build $branch
 $SRC/s/preview version
 for game in 2 3 4 ; do
 	$SRC/s/preview -g $game run && \