diff --git a/requests_kerberos/kerberos_.py b/requests_kerberos/kerberos_.py
index 18de33d..c50b9f5 100644
--- a/requests_kerberos/kerberos_.py
+++ b/requests_kerberos/kerberos_.py
@@ -427,7 +427,7 @@ def deregister(self, response):
         response.request.deregister_hook('response', self.handle_response)
 
     def __call__(self, request):
-        if self.force_preemptive and not self.auth_done:
+        if self.force_preemptive:
             # add Authorization header before we receive a 401
             # by the 401 handler
             host = urlparse(request.url).hostname