diff --git a/src/db/runtime.js b/src/db/runtime.js
index 54b025d..cedefaa 100644
--- a/src/db/runtime.js
+++ b/src/db/runtime.js
@@ -5,12 +5,12 @@ const SqliteDatabase = require('better-sqlite3');
 const pools = new Map();
 
 function isPostgresEnabled() {
-  return String(process.env.DURIIN_DB_BACKEND || '').toLowerCase() === 'postgres' || Boolean(process.env.DATABASE_URL && process.env.DURIIN_USE_POSTGRES === 'true');
+  return String(process.env.DURIIN_DB_BACKEND || '').toLowerCase() === 'postgres' || Boolean((process.env.DURIIN_POSTGRES_URL || process.env.DATABASE_URL) && process.env.DURIIN_USE_POSTGRES === 'true');
 }
 
 function poolFor(schema) {
-  const connectionString = process.env.DATABASE_URL;
-  if (!connectionString) throw new Error('DATABASE_URL is required for postgres runtime');
+  const connectionString = process.env.DURIIN_POSTGRES_URL || process.env.DATABASE_URL;
+  if (!connectionString) throw new Error('DURIIN_POSTGRES_URL is required for postgres runtime');
   const key = `${connectionString}|${schema}`;
   if (!pools.has(key)) {
     pools.set(key, new Pool({