diff --git a/cvat/settings/base.py b/cvat/settings/base.py
index 08ae7e2b4e0d..e5f577d448b6 100644
--- a/cvat/settings/base.py
+++ b/cvat/settings/base.py
@@ -192,7 +192,8 @@ def generate_ssh_keys():
 CORS_ALLOW_CREDENTIALS = True
 CSRF_TRUSTED_ORIGINS = [UI_HOST]
 UI_URL = '{}://{}'.format(UI_SCHEME, UI_HOST)
-if len(UI_URL):
+
+if UI_PORT and UI_PORT != '80':
     UI_URL += ':{}'.format(UI_PORT)
 
 CORS_ORIGIN_WHITELIST = [UI_URL]