diff --git a/ms_identity_web/__init__.py b/ms_identity_web/__init__.py
index f26b7c6..017c471 100644
--- a/ms_identity_web/__init__.py
+++ b/ms_identity_web/__init__.py
@@ -80,7 +80,7 @@ def get_auth_url(self, redirect_uri:str = None, b2c_policy: str = None, **msal_a
             configures B2C if app type is set to B2C."""
         auth_req_options = self.aad_config.auth_request.__dict__.copy()
         auth_req_options.update(**msal_auth_url_kwargs)
-        if redirect_uri:
+        if redirect_uri and auth_req_options['redirect_uri'] is None:
             auth_req_options['redirect_uri'] = redirect_uri
         self._generate_and_append_state_to_context_and_request(auth_req_options)