diff --git a/src/main/resources/application-prod.properties b/src/main/resources/application-prod.properties
index d944467..0784c77 100644
--- a/src/main/resources/application-prod.properties
+++ b/src/main/resources/application-prod.properties
@@ -4,4 +4,4 @@
 # URL of the Eureka service
 eureka.client.serviceUrl.defaultZone=http://${EUREKA_INTERNAL_DOMAIN:book-a-book-eureka}:${EUREKA_INTERNAL_PORT:8761}/eureka
 
-server.port=80
\ No newline at end of file
+server.port=${PORT:80}
\ No newline at end of file