diff --git a/slave_scripts/wait_for_puppet.sh b/slave_scripts/wait_for_puppet.sh
index 9f6bdd02..4dfc6589 100755
--- a/slave_scripts/wait_for_puppet.sh
+++ b/slave_scripts/wait_for_puppet.sh
@@ -11,10 +11,10 @@ HOSTS=$@
 echo "Jenkins: Waiting for puppet to complete on all nodes"
 DONE=0
 while [ $DONE != 1 ]; do
-    DONE=0
+    DONE=1
     for hostname in $HOSTS
     do
-	if (grep "$hostname $FINISH_RE" $LOGFILE >/dev/null); then DONE=1; fi
+	if !(grep "$hostname $FINISH_RE" $LOGFILE >/dev/null); then DONE=0; fi
     done
     sleep 5
 done