diff --git a/templates/etc/cups/cups-files.conf.j2 b/templates/etc/cups/cups-files.conf.j2
index ae66ccc..f63c580 100644
--- a/templates/etc/cups/cups-files.conf.j2
+++ b/templates/etc/cups/cups-files.conf.j2
@@ -18,7 +18,7 @@
 
 # Administrator user group, used to match @SYSTEM in cupsd.conf policy rules...
 # This cannot contain the Group value for security reasons...
-SystemGroup {{ cups_system_groups }}
+SystemGroup {{ cups_system_groups | join(' ') }}
 
 
 # User that is substituted for unauthenticated (remote) root accesses...