diff --git a/docker/docker-compose.yml b/docker/docker-compose.yml
index 96d20fc42ab..1d0914a5b5a 100644
--- a/docker/docker-compose.yml
+++ b/docker/docker-compose.yml
@@ -17,7 +17,8 @@ services:
       TZ: ${TIMEZONE:-Europe/Bratislava}
       DSPACE_UI_SSL: 'false'
       DSPACE_UI_HOST: dspace-angular
-      DSPACE_UI_PORT: ${UI_PORT:-4000}
+      # Use only 4000, not the {UI_PORT} from the .env because in the container it is always 4000
+      DSPACE_UI_PORT: 4000
       DSPACE_UI_NAMESPACE: ${DSPACE_UI_NAMESPACE:-/}
       DSPACE_REST_SSL: ${DSPACE_SSL:-false}
       DSPACE_REST_HOST: ${DSPACE_HOST:-localhost}