diff --git a/src/django_routify/router.py b/src/django_routify/router.py
index b4e8f9f..ca3bd71 100644
--- a/src/django_routify/router.py
+++ b/src/django_routify/router.py
@@ -84,7 +84,7 @@ def register(view: FUNC_VIEW | View) -> FUNC_VIEW | View:
                 if url_path != '':
                     url_path += '/'
 
-            if url_path == '/' and self.__prefix[-1] == '/':
+            if url_path == '/' and self.__prefix[-1:] == '/':
                 url_path = ''
 
             if self.__auto_naming and not name: