diff --git a/Dockerfile b/Dockerfile
index bc000b3..025212e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -30,6 +30,7 @@ ENV INBUCKET_SMTP_TIMEOUT 30s
 ENV INBUCKET_POP3_TIMEOUT 30s
 ENV INBUCKET_WEB_GREETINGFILE /config/greeting.html
 ENV INBUCKET_WEB_COOKIEAUTHKEY secret-inbucket-session-cookie-key
+ENV INBUCKET_WEB_UIDIR=ui
 ENV INBUCKET_STORAGE_TYPE file
 ENV INBUCKET_STORAGE_PARAMS path:/storage
 ENV INBUCKET_STORAGE_RETENTIONPERIOD 72h