diff --git a/templates/unattended-upgrades.j2 b/templates/unattended-upgrades.j2
index eca0c74..417466c 100644
--- a/templates/unattended-upgrades.j2
+++ b/templates/unattended-upgrades.j2
@@ -37,7 +37,7 @@ Unattended-Upgrade::Origins-Pattern {
 //      "o=Debian,a=proposed-updates";
 //      "o=Debian Backports,a=${distro_codename}-backports,l=Debian Backports";
 {{ for o in autoupdate_origins }}
-        "origin={{ o.origin }}{{ (',codename=' + o.codename) if o.codename is defined }}{{ (',archive=' + o.archive) if o.archive is defined }}";
+        "origin={{ o.origin }}{{ ',codename=' ~ o.codename if o.codename is defined }}{{ ',archive=' ~ o.archive if o.archive is defined }}";
 {{ endfor }}
 };