diff --git a/CHANGELOG.md b/CHANGELOG.md
index cb3fbad3..cb09714e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,20 +7,24 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-| :warning:  WARNING                                                                                                                 |
-| ---------------------------------------------------------------------------------------------------------------------------------- |
-| This version of `blockfrost-backend-ryo` requires `cardano-db-sync 13.1.1.3` or newer. Use version `1.7.x` for earlier releases.   |
+| :warning: WARNING                                                                                                                |
+| -------------------------------------------------------------------------------------------------------------------------------- |
+| This version of `blockfrost-backend-ryo` requires `cardano-db-sync 13.1.1.3` or newer. Use version `1.7.x` for earlier releases. |
 
 ### Added
 
 - translation of cost models from numerical IDs to strings,
   required for `cardano-db-sync 13.1.1.3` and newer [#130](https://github.com/blockfrost/blockfrost-backend-ryo/pull/130)
 
-### Updated
+### Changed
 
 - node_modules
 - yarn
 
+### Fixed
+
+- port configuration via config option `dbSync.port`
+
 ## [1.7.0] - 2023-08-30
 
 ### Added
diff --git a/src/config.ts b/src/config.ts
index e84c357b..e57225b4 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -24,8 +24,9 @@ export const loadConfig = () => {
     process.env.BLOCKFROST_CONFIG_DBSYNC_HOST ?? config.get<string>('dbSync.host');
   const databaseSyncUser =
     process.env.BLOCKFROST_CONFIG_DBSYNC_USER ?? config.get<string>('dbSync.user');
-  const databaseSyncPort =
-    Number(process.env.BLOCKFROST_CONFIG_DBSYNC_PORT) ?? config.get<number>('dbSync.port');
+  const databaseSyncPort = process.env.BLOCKFROST_CONFIG_DBSYNC_PORT
+    ? Number(process.env.BLOCKFROST_CONFIG_DBSYNC_PORT)
+    : config.get<number>('dbSync.port');
   const databaseSyncDatabase =
     process.env.BLOCKFROST_CONFIG_DBSYNC_DATABASE ?? config.get<string>('dbSync.database');
   const databaseSyncPassword =