diff --git a/installer/install.sh b/installer/install.sh
index e101eb97..5a44ce72 100755
--- a/installer/install.sh
+++ b/installer/install.sh
@@ -287,7 +287,7 @@ tee -a /etc/crontab <<EOF
 27 3 * * *    root 	dcres.sh
 
 # Delete elastic indices older than 90 days (kibana index is omitted by default)
-27 4 * * *    root  docker exec elk bash -c '/usr/local/bin/curator --host 127.0.0.1 delete indices --older-than 90 --time-unit days --timestring '%Y.%m.%d''
+27 4 * * *    root  docker exec elk bash -c '/usr/local/bin/curator --host 127.0.0.1 delete indices --older-than 90 --time-unit days --timestring \%Y.\%m.\%d'
 
 # Update IP and erase check.lock if it exists
 27 15 * * *   root  /etc/rc.local