diff --git a/Dockerfile b/Dockerfile
index 942ac18..e7b84e5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM node:alpine
 
-ARG PORT
+ARG PORT="3000"
 ENV PORT=$PORT
 
 COPY . .
diff --git a/src/environment.ts b/src/environment.ts
index 1a7279b..3d412bf 100644
--- a/src/environment.ts
+++ b/src/environment.ts
@@ -7,7 +7,7 @@ dotenv.config();
 dotenv.config({path: '.env.local', override: true});
 
 export const environment = {
-	port: process.env['PORT'] || 3000,
+	port: process.env['PORT'] ? +process.env['PORT'] : 3000,
 	production: !process.env.NODE_ENV || ['prod', 'production'].includes(process.env.NODE_ENV.toLowerCase()),
 	tickers: process.env['TICKERS']?.split(',') || [],
 	token: process.env['TOKEN'],