diff --git a/django/core/handlers/wsgi.py b/django/core/handlers/wsgi.py
index df6afdd297..50766cb7aa 100644
--- a/django/core/handlers/wsgi.py
+++ b/django/core/handlers/wsgi.py
@@ -219,7 +219,7 @@ def get_script_name(environ):
 
     if script_url:
         path_info = get_bytes_from_wsgi(environ, 'PATH_INFO', '')
-        script_name = script_url[:-len(path_info)]
+        script_name = script_url[:-len(path_info)] if path_info else script_url
     else:
         script_name = get_bytes_from_wsgi(environ, 'SCRIPT_NAME', '')
 
diff --git a/tests/handlers/tests.py b/tests/handlers/tests.py
index a1fed74105..e7c03dd971 100644
--- a/tests/handlers/tests.py
+++ b/tests/handlers/tests.py
@@ -2,7 +2,7 @@
 
 from __future__ import unicode_literals
 
-from django.core.handlers.wsgi import WSGIHandler, WSGIRequest
+from django.core.handlers.wsgi import WSGIHandler, WSGIRequest, get_script_name
 from django.core.signals import request_finished, request_started
 from django.db import close_old_connections, connection
 from django.test import (
@@ -200,3 +200,14 @@ class HandlerNotFoundTest(TestCase):
     def test_environ_path_info_type(self):
         environ = RequestFactory().get('/%E2%A8%87%87%A5%E2%A8%A0').environ
         self.assertIsInstance(environ['PATH_INFO'], six.text_type)
+
+
+class ScriptNameTests(TestCase):
+    def test_get_script_name(self):
+        # Regression test for #23173
+        # Test first without PATH_INFO
+        script_name = get_script_name({'SCRIPT_URL': '/foobar/'})
+        self.assertEqual(script_name, '/foobar/')
+
+        script_name = get_script_name({'SCRIPT_URL': '/foobar/', 'PATH_INFO': '/'})
+        self.assertEqual(script_name, '/foobar')