diff --git a/templates/acng.conf.j2 b/templates/acng.conf.j2
index d024e33..8ff9138 100644
--- a/templates/acng.conf.j2
+++ b/templates/acng.conf.j2
@@ -29,4 +29,4 @@ VfilePatternEx: ^/\?release=[0-9]+&arch=
 # that causes more intermittent 503 errors. This DontCache line
 # tells apt-cacher-ng to allow requests for these to pass through
 # without being cached.
-DontCache: (mirrorlist.centos.org)|(mariadb.org.*.bz2$)
+DontCache: (mirrorlist\.centos\.org)|(mariadb\.org.*\.bz2$)