diff --git a/tasks/koji/base_builder.yml b/tasks/koji/base_builder.yml
index f3ccd3b0c4..073fa66c44 100644
--- a/tasks/koji/base_builder.yml
+++ b/tasks/koji/base_builder.yml
@@ -133,7 +133,7 @@
 
 - name: mock site-defaults.cfg
   action: copy src=$files/kojibuilder/builders/site-defaults.cfg dest=/etc/mock/site-defaults.cfg mode=0644 owner=root group=mock
-  when: not inventory_hostname.startswith(('bkernel')
+  when: not inventory_hostname.startswith('bkernel')
 
 - name: ntp steptickers
   action: copy src=$files/common/step-tickers dest=/etc/ntp/step-tickers