diff --git a/fhirclient/auth.py b/fhirclient/auth.py
index fb3e3b9d7..af77c27c3 100644
--- a/fhirclient/auth.py
+++ b/fhirclient/auth.py
@@ -200,7 +200,7 @@ def _authorize_params(self, server):
         if server is None:
             raise Exception("Cannot create an authorize-uri without server instance")
         if self.auth_state is None:
-            self.auth_state = str(uuid.uuid4())[:8]
+            self.auth_state = str(uuid.uuid4())
             server.should_save_state()
         
         params = {