diff --git a/src/config.ts b/src/config.ts
index e5fefb42..17d8730e 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -80,7 +80,7 @@ export function resolveConnectionsFromEnv(): ConnectionConfig[] {
   const connection = {
     client: process.env.DB_CLIENT,
     host: process.env.DB_HOST,
-    port: +(process.env.DB_PORT || 1433),
+    port: process.env.DB_PORT ? +(process.env.DB_PORT) : null,
     user: process.env.DB_USERNAME,
     password: process.env.DB_PASSWORD,
     database: process.env.DB_NAME,