diff --git a/playbooks/manual/staging-sync/koji.yml b/playbooks/manual/staging-sync/koji.yml
index de3b524373..e834e22e1d 100644
--- a/playbooks/manual/staging-sync/koji.yml
+++ b/playbooks/manual/staging-sync/koji.yml
@@ -136,7 +136,7 @@
     shell: umount /mnt/fedora_koji && mount /mnt/fedora_koji
     args:
       warn: false
-    when: '.s390.' not in inventory_hostname
+    when: "'.s390.' not in inventory_hostname"
 
 - name: remount NFS on builders, composers, bodhi and odcs
   hosts: builders-stg