diff --git a/modules/nixos-wiki/default.nix b/modules/nixos-wiki/default.nix
index 5e0b217..85fe758 100644
--- a/modules/nixos-wiki/default.nix
+++ b/modules/nixos-wiki/default.nix
@@ -185,14 +185,14 @@ in
     # so we don't actually need the index on that column.
     systemd.services.mediawiki-init.script = lib.mkAfter ''
       if [ ! -f /var/lib/mediwiki/.mediawiki-job-index-fix ]; then
-        psql -U postgres -d mediawiki -c <<'EOF'
+        ${config.services.postgresql.package}/bin/psql -d ${lib.escapeShellArg config.services.mediawiki.database.name} <<'EOF'
       DROP INDEX IF EXISTS job_cmd;
       -- the original index looks like this, we leave job_params out because it gets too long
       -- CREATE INDEX job_cmd ON job (job_cmd, job_namespace, job_title, job_params);
       -- source: https://github.com/wikimedia/mediawiki/blob/17079782a776849ec51d5c3d3712edc217cce65b/maintenance/postgres/tables-generated.sql#L480
       CREATE INDEX job_cmd ON job (job_cmd, job_namespace, job_title);
       EOF
-        touch /var/lib/mediwiki/.mediawiki-job-index-fix
+        touch /var/lib/mediawiki/.mediawiki-job-index-fix
       fi
     '';