diff --git a/images/openwisp_nginx/get_domain.py b/images/openwisp_nginx/get_domain.py
index 254cdfb5..afa78178 100644
--- a/images/openwisp_nginx/get_domain.py
+++ b/images/openwisp_nginx/get_domain.py
@@ -1,7 +1,4 @@
 import os
 import sys
 
-import tldextract
-
-ext = tldextract.extract(os.environ['API_DOMAIN'])
-sys.stdout.write(ext.registered_domain)
+sys.stdout.write(".".join(os.environ['API_DOMAIN'].split(".")[1:]))
diff --git a/images/openwisp_nginx/requirements.txt b/images/openwisp_nginx/requirements.txt
index d844bddd..e69de29b 100644
--- a/images/openwisp_nginx/requirements.txt
+++ b/images/openwisp_nginx/requirements.txt
@@ -1 +0,0 @@
-tldextract~=3.2.0