diff --git a/git/post-receive b/git/post-receive
index 2332892..070f50d 100755
--- a/git/post-receive
+++ b/git/post-receive
@@ -63,7 +63,7 @@ trigger_jenkins()
   # ...
 }
 
-if [ -n "$1" -a -n "$2" -a -n "$3" ]; then
+if [ -n "$1" ] && [ -n "$2" ] && [ -n "$3" ]; then
   trigger_jenkins $2 $3 $1
 else
   while read oldrev newrev refname; do