diff --git a/lib.nix b/lib.nix
index 4dd3cdc..586ae93 100644
--- a/lib.nix
+++ b/lib.nix
@@ -108,13 +108,15 @@ in
           )
         );
       };
-      setupInitialDatabases = if initialDatabases != [] then (
-        lib.concatMapStrings (db: ''
-        echo "Checking presence of database ${db.name}"
-        dbAlreadyExists="$(echo "SELECT 1 AS result FROM pg_database WHERE datname='${db.name}';" | psql --dbname postgres | ${pkgs.gnugrep}/bin/grep -c 'exists = "1"' || true)"
-        echo $dbAlreadyExists
-        '') initialDatabases
-        );
+      setupInitialDatabases =
+        if initialDatabases != [ ] then
+          (lib.concatMapStrings (db: ''
+            echo "Checking presence of database ${db.name}"
+            dbAlreadyExists="$(echo "SELECT 1 AS result FROM pg_database WHERE datname='${db.name}';" | psql --dbname postgres | ${pkgs.gnugrep}/bin/grep -c 'exists = "1"' || true)"
+            echo $dbAlreadyExists
+          '') initialDatabases)
+        else
+          "";
       setupScript = pkgs.writeShellApplication {
         name = "setup-postgres";
         runtimeInputs = [